Log in

Relevant bibliographies by topics / Friesians / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Friesians.

Dissertations / Theses on the topic 'Friesians'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Friesians.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Fueyo, Domic Francisca. "Comparación entre novillos Holstein Friesian e híbridos Belga Azul x Holstein Friesian considerando rendimiento, desposte comercial y características de canal." Tesis, Universidad de Chile, 2007. http://repositorio.uchile.cl/handle/2250/130840.

Full text

Abstract:

Memoria para optar al Título Profesional de Médico Veterinario
Esta memoria tuvo por objeto evaluar el resultado del cruzamiento bovinos de la raza Belga Azul, de gran conformación y rendimiento carnicero, con la raza lechera Holstein. En este manejo genético, muy común en la Unión Europea, se utilizan vacas adultas con menores índices productivos, de las cuales no es conveniente obtener reemplazos para el rebaño lechero. En lecherías cercanas a Los Ángeles, VIII Región, Chile, se inseminaron vacas Holstein con semen de toros Belga Azul, importado desde Bélgica. Los terneros machos fueron criados, castrados y engordados en las mismas lecherías hasta que se enviaron a una planta faenadora (Carnes Ñuble, Chillán, Chile), junto a los novillos Holstein controles. A un grupo de novillos Holstein puros (controles) se les aplicó un implante hormonal, normalmente utilizado en la engorda de novillos lecheros. Se evaluó el rendimiento a la vara, al desposte y las características de la canal de los novillos híbridos Belga Azul x Holstein y de los novillos Holstein Friesian puros, engordados en las mismas lecherías, con y sin implante hormonal. Se produjo un aumento estadísticamente significativo (p ≤ 0,05) para los híbridos Belga Azul x Holstein sobre ambos grupos de novillos Holstein con y sin implante hormonal, en las siguientes características: Peso de la canal (20 Kg. y 63 Kg. respectivamente), rendimiento en vara (casi 13% en ambos), rendimiento al desposte (7,55% y 6,59% respectivamente), siendo de mayor magnitud en los cortes mas valorados comercialmente, que a su vez son los de mayor demanda para exportación. En cuanto a las características cualitativas de la canal, se observó un aumento significativo (p ≤ 0,05) a favor del híbrido para el área del ojo del lomo de 38%, buen indicador de carnosidad de la canal

APA, Harvard, Vancouver, ISO, and other styles

2

Muya, Claude Mukengela. "Effects of virginiamycin and monensin of milk production efficiency and blood metabolites in Holstein cows." Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-08202008-121518.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Krikcziokat, Jana Uta. "Peripartaler Säure-Basen-Status bei niedersächsischen Holstein Friesian- Milchkühen." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-172844.

Full text

Abstract:

Azidotische Belastungen des Pansens gelten bei Milchkühen besonders in der Frühlaktation als weit verbreitet. Sie werden als subakute Pansenazidosen (SARA) für die häufigen Produktionskrankheiten verantwortlich gemacht. Ziele : dieser Untersuchungen waren a) die Kontrolle des Säure-Basen-Haushalt (SBH) bei HF- Hochleistungskühen im peripartalen Zeitraum zum Vorkommen von SARA, b) die Prüfung bewährter sowie neuer Methoden zur Pansensaftanalyse, c) die Analyse von SBH-Harnparametern sowie d) die Prüfung möglicher Beziehungen von Stoffwechselparametern im Blut zu SBH-Parametern im Pansensaft. Versuchsanordnung : In 10 Betrieben Niedersachsens wurden an je 10 Kühen Verlaufsuntersuchungen mit vier Proben/Tier durchgeführt: 1. Trockenstehperiode/Färsen -30 Tage ante partum (d a.p.) bis zur Kalbung; 2. 2 bis 7 Tage post partum (d p.p.); 3. in der Frühlaktation 8 bis 30 d p.p. und 4. in der Mittellaktation 80 bis 150 d p.p. Pansensaft vormittags mit Geishauser- Sonde gewonnen, Blut aus der V. jugularis externa sowie Harn per Blasenkathederisierung. Analysiert wurden im Pansensaft der pH-Wert, die Pufferkapazität als Titrationsbilanz über die Titrationsazidität und - alkalität, die Methylenblauprobe sowie die Sedimentaktivitätszeit (SAT), im Harn der pH-Wert, die Netto-Säure-Basen-Ausscheidung (NSBA) sowie der Basen-Säure-Quotient (BSQ) und im Blutserum Glukose, freie Fettsäuren (FFS), Betahydroxybutyrat (BHB), L-Laktat, Cholesterol, Protein, Albumin, Bilirubin, Harnstoff, Kreatinin, Na, K, Cl, Ca, P, Mg, ALP, ASAT, GLDH sowie die CK. Ergebnisse: Zwischen Kühen und Färsen wurden bei den gemessenen Parametern keine gesicherten Unterschiede festgestellt. Es gab auch keine Unterschiede zwischen den Betrieben. Die Pansen-pH-Werte bewegten sich von x= 6,8 (6,43/7,0;1./3. Quartil) zu Beginn des Trockenstehens über minimal x = 6,3 (5,9/6,7) 30 bis 60 d p.p. bis x = 6,6 (6,2/6,8) in der Mittellaktation. Sie lagen alle im physiologischen Bereich. 20 Kühe hatten Pansen-pH-Werte von < 5,8, 6 Kühe von < 5,5 und 21 Kühe von > 7,2. Damit kamen die Kühe der SARA-Definition, bezogen auf das einmalige Auftreten von pH-Werten < 5,8 bei einer Kuh, nahe; bezogen auf alle gemessenen Pansen-pH-Werte betrug der Anteil < 5,8 aber nur 9,8 %. Die Titrationsbilanz war in der Trockensteherperiode ausgeglichen; bei allen drei Kontrollen p.p. bestand ein Basendefizit. Die Pufferkapazität war in der 1. Woche p.p. und in der Frühlaktation vermindert. Panse-pH-Werte und Titrationsbilanz korrelierten sehr eng (r=0,98,p<0,001). Die Methylenblauprobe war a.p. mit x = 3:37 (2:22/4:59) Minuten am längsten, in der Mittellaktation mit 3:01 (2:25/4:30) Minuten am kürzesten und ingesamt physiologisch. Es gab keine signifikanten Unterschiede zwischen den einzelnen Kontollzeiträumen. Die SAT war physiologisch und schwankte zwischen zwei und fünf Minuten ohne signifikante Unterschiede zwischen den Entnahmezeiträumen. Im Harn lagen die NSBA mit x = 70 mmol/l (20/122 = 1./3.Quartil) und der BSQ mit x = 2,2 (1,6/2,8) nur bei den Frischmelkern unter den unteren Grenzwerten und deuteten die Gefahr von SARA an. Der Harn-pH-Wert war mit x = 7,98 (7,7/8,2) physiologisch. Von der Gesamtheit alle NSBA-Werte waren 37% < 83 mmol/l sowie 28,9% < 25 mmol/l; beim BSQ waren es 52,6% < 2,5 sowie 27,4% < 1,5. Die für die NSBA, den BSQ und den Harn-pH-Wert berechneten Sensivitäten und Spezifitäten für einen Pansen-pH-Wert < 5,8 liegen mit 44,8% und 64,5% (NSBA), 55,8% und 47,9% (BSQ) sowie 2,3% und 97% (Harn-pH-Wert) unter den diagnostischen Erfordernissen.Sie können somit keine sicheren Rückschlüsse auf den Pansenzustand geben. Bei den Blutbefunden wurden Kühe mit Pansen-pH-Werten < 5,8 (SARA) und >5,8 gegenüber gestellt. Die Korrelationskoeffizienten, die Sensitivität und die mittels Receiver-Operating-Characteristics Analysen ermittelten Flächen unter der Kurve zwischen Pansen-pH-Wert und den Blutparametern waren niedrig ( p> 0,05). Schlussfolgerung: Hochleistende HF-Kühe haben peripartal nicht zwangsläufig eine SARA. Die Titrationsbilanz ergänzt den Pansensaft-pH-Wert, ist routinemäßig aber nicht nötig. Im Harn liegen die NSBA und BSQ häufiger unter den Grenzwerten und korrelieren nicht gesichert mit dem Pansen-pH-Wert. Auch Blutparameter erlauben keine sichere Aussage über den Pansenzustand. Die Diagnose von SARA muss mit direkter Messung des Pansen-pH-Wertes gestellt werden.

APA, Harvard, Vancouver, ISO, and other styles

4

Novaes, Luciano Patto. "Growth, body composition and costs of feeding Holstein heifers /." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-135927/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Hansen, Kirsten [Verfasser]. "Untersuchungen zur postpartalen Hypophosphatämie bei Holstein Friesian Kühen / Kirsten Hansen." Berlin : Freie Universität Berlin, 2018. http://d-nb.info/1155167104/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Nantapo, Carlos Wyson Tawanda. "Effect of stage of lactation on milk yield, somatic cell counts, mineral and fatty acid profiles in pasture-based Friesian, Jersey and Friesian × Jersey cows." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/d1006810.

Full text

Abstract:

The effect of stage of lactation on milk yield, somatic cell counts, mineral and fatty acid profiles in pasture-based Friesian, Jersey and Friesian × Jersey cows was investigated. Twenty Friesian, twenty Jersey and twenty Friesian × Jersey cows were randomly selected from a dairy herd. A total of 202 milk samples were collected and analysed in three stages of lactation. Genotypic differences were observed in milk yield and fat content. Friesian cows produced the highest yield and lowest fat content whereas the opposite was true for Jersey cows (P<0.01). No significant differences were observed in SCC in the different genotypes, but SCC levels were higher in mid and late lactation (P<0.001). There was no effect (P<0.005) of genotype and stage of lactation interaction on Ca, P, Mg, Na, Mn and Bo concentration. Jersey cows had the least concentration of Fe and Cu in all stages of lactation. Strong positive correlations were observed among Ca and P, Mg and Zn. Aluminium had a strong positive relationship with Bo, Fe, Mn and Zn (P<0.001). Generally, SCC had a weak positive relationship with macro elements but a significant negative relationship with microelements. Yield levels were negatively correlated with Mg, Na, Al, Mn and SCC. Pasture ALA, SFA, n-3, n-6/n-3 and PUFA/MUFA concentration did not differ across the study period. Linoleic acid was highest in the second phase which coincides with mid lactation in cows (P<0.001). Highest moisture content coincided with the least fat free dry matter content in early lactation (P<0.001). Significantly high fat content was observed in late lactation than in early lactation. Highest butyric, caproic, linoleic, n-6 and PUFA were observed for Friesian cows. All other fatty acids ratios were not significantly different among different genotypes. Highest CLA, ALA, LA, SFA, PUFA, n-6, and n-3 and atherogenicity index were observed in early lactation whereas desaturase activity indices were highest in late lactation. Strong positive correlations were observed among milk vaccenic, ALA, LA and CLA concentrations. Inverse relationships were observed between SFA and long chain fatty acids. It can be concluded, it may be of advantage to consume milk from early stage of lactation poses a lower risk to coronary diseases and are much safer to consume.

APA, Harvard, Vancouver, ISO, and other styles

7

Yeboah, Charles Asomaning. "Genetic variability of growth curves in dairy heifers." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116065.

Full text

Abstract:

The objective of this study was to evaluate the variability of growth curves of dairy heifers and estimate genetic parameters. 15066 records taken from birth until 26 months (808 days) on 2754 heifers of Quebec were considered. The pedigree file comprised 10123 animals. The Mixed procedure of SAS with ordinary polynomials was used for simple phenotypic analyses, fitting fixed linear, quadratic and cubic regressions of body weight (in kilograms) on age (in months) as well as random intercept, and random linear and quadratic regressions for each animal. The Wombat program (Meyer, 2007), with Legendre polynomials was used to estimate the genetic parameters by fitting fixed herd-year-season of birth and quartic regression of body weight on age in days, as well as random regressions for quadratic additive genetic and cubic permanent environmental effects. Heritability estimates of body weight ranged from 0.22 at around 70 days to 0.45 at around 210 days. Heritabilities of body weight at birth and 808 days were 0.35 and 0.32, respectively. The additive genetic correlations between body weights at different ages ranged from -0.37 to 1.00. In general, the genetic correlations were higher than the permanent environmental and phenotypic correlations.

APA, Harvard, Vancouver, ISO, and other styles

8

Wonsil, Brian John. "Biohydrogenation, postruminal flow, and apparent digestibility of dietary lipids in lactating Holstein cows." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-12302008-063010/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Perrey, Anette. "Ethologische Untersuchungen an Besamungsbullen (Holstein Friesian, Red Holstein) unter besonderer Berücksichtigung des Tier-Mensch-Verhältnisses." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961816007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Abdul-Jamak, Md Eusof. "The assessment of management strategies for milk production by exotic and cross breeds of dairy cattle in the tropics." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284312.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Heggemann, Volker [Verfasser]. "Untersuchungen zur Diagnostik der Spurenelementversorgung von Holstein-Friesian-Milchkühen / Volker Heggemann." Berlin : Freie Universität Berlin, 2014. http://d-nb.info/1047796767/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Logan, Karen Elizabeth. "Immunological responses of Holstein-Friesian cattle to Staphylococcus aureus in vitro." Thesis, University of Glasgow, 2001. http://theses.gla.ac.uk/6904/.

Full text

Abstract:

The aim of this study was to develop and evaluate an in vitro proliferative response of peripheral blood mononuclear cells (PBM) isolated from Holstein-Friesian cattle, induced by formalin-killed Staphylococcus aureus, a major mastitis pathogen, as a potential indicator of resistance or susceptibility to mastitis. Different strains of S. aureus, isolated from cows with subclinical mastitis, and identified by restriction enzyme fragmentation pattern analysis, were shown to induce different levels of proliferation of PBM in vitro. One particular strain (strain A), induced the strongest proliferation response compared to the other strains tested and differences in the magnitude of the proliferative response, induced by S. aureus strain A, was noted among cows. Phenotypic analysis of PBM of cows, by flow cytometry, showed that normal proportions of cell sub-populations were present at the start of culture and that the proliferating cell population consisted mainly of T cells expressing CD4, CD8 or markers. Proliferation of PBM of cows, induced by Staphylococcal Enterotoxin B (SEB), showed that the peak day of proliferation occurred 72 to 96 hours earlier in the presence of SEB compared to in the presence of S. aureus strain A antigen. A statistically significant difference in the proliferative response induced by S. aureus strain A was seen in two progeny groups sired by two different commercial bulls, suggesting that genetic control of this response may be important in protection of the mammary glands against infection. The proliferative assay was, therefore, subsequently performed in bulls.

APA, Harvard, Vancouver, ISO, and other styles

13

Vance, E. R. "A comparison of the performance and feeding behaviour of Holstein-Friesian dairy cows and Jersey and Holstein-Friesian crossbred dairy cows, within grassland based milk production systems." Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546446.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Bethard, Greg L. "Effect of energy and undegraded intake protein on growth and feed efficiency of growing Holstein heifers." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-05042010-020309/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Smith, Bradford Bruce. "Comparison of relative net income with and without the application of opportunity cost." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-03022010-020200/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Mur, Novales Ramón Miguel. "Fetal-maternal crosstalk in holstein-friesian heifers experimentally infected with neospora caninum." Doctoral thesis, Universitat de Lleida, 2018. http://hdl.handle.net/10803/664189.

Full text

Abstract:

El objetivo global de esta tesis fue expandir el conocimiento sobre cómo afecta una infección con Neospora caninum a la comunicación materno-fetal y a la inmunomodulación uterina. En el primer estudio se evaluó el desenlace de la gestación de novillas experimentalmente infectadas con N. caninum en el segundo trimestre de gestación y la respuesta inmune del feto tras la infección.El objetivo del segundo estudio fue examinar las dinámicas de PAG-1 y PAG-2 y las poblaciones de células trofoblasticas después de una infección con N. caninum. El tercer estudio se diseñó para determinar el efecto de una infección experimental con N. caninum en novillas lecheras en las concentraciones de PAG-1 y PAG-2 y los niveles de pH en los fluidos amniótico y alantoideo.En el cuarto estudio se examinaron los patrones de expresión de los genes SERPINA14, PAG1 y PAG2 en la interfase materno-fetal de novillas lecheras experimentalmente infectadas con N. caninum. En el anexo se calculó el coste de la neosporosis bovina para las granjas lecheras españolas en 42 millones de dólares al año. Nuestra conclusion fue que la infección por N. caninum modifica la comunicación materno-fetal y el equilibrio inmunológico de la gestación.
The global aim of this thesis was to expand the knowledge about how Neospora caninum infection affects fetal-maternal crosstalk and uterine immunomodulation.In the first study we evaluated the outcome of pregnancy in dairy heifers after an experimental infection with N. caninum in the second trimester of gestation and we examined the immune response in the fetus .The aim of the second study was to examine PAG-1 and PAG-2 dynamics and trophoblast cell populations following an experimental infection with N. caninum. The third study was designed to determine the effect of an experimental infection of pregnant dairy heifers with N. caninum on PAG-1 and PAG-2 concentrations and pH in amniotic and allantoic fluids.In the fourth study we examined the expression patterns of the genes SERPINA14, PAG1, and PAG2 at the fetal-maternal interface in dairy heifers experimentally infected with N. caninum.In the appendix we estimated the cost of N. caninum infection for the Spanish dairy industry to be $42 million per year. We concluded that N. caninum infection modifies the fetal-maternal crosstalk and the immunological balance of gestation and an increased Th1 immune response during gestation is needed to prevent N. caninum induced abortion.
L'objectiu global d'aquesta tesi va ser ampliar el coneixement sobre com afecta una infecció amb Neospora caninum a la comunicació materno-fetal i la immunomodulació uterina. En el primer estudi es va avaluar el desenllaç de la gestació de vedelles experimentalment infectades amb N. caninum en el segon trimestre de gestació i la resposta inmune del fetus després de la infecció. L'objectiu del segon estudi va ser examinar les dinàmiques de PAG-1 i PAG -2 i les poblacions de cèl·lules trofoblàstiques després d'una infecció amb N. caninum. El tercer estudi es va dissenyar per determinar l’efecte d’ una infecció experimental de N. caninum en vedellles lleteres sobre les concentracions de PAG-1 i PAG-2 i els nivells de pH 20 en els fluïds amniòtic i alantoideu. Al quart estudi es van examinar els patrons d’expressió dels gens SERPINA14, PAG1 i PAG2 en l’interfase materno-fetal de les vedelles lleteres experimentalment infectades amb N. caninum. A l'annex es va calcular el cost de la neosporosi bovina per a les granges lleteres espanyoles en 42 milions de dòlars anuals. La nostra conclusió va ser que la infecció per N. caninum modifica la comunicació materno-fetal i l'equilibri immunològic de la gestació.

APA, Harvard, Vancouver, ISO, and other styles

17

Pretorius, Susan Mathilda. "Evaluation of the selection and breeding of Friesian horses in Southern Africa." Pretoria : [s.n.], 2005. http://upetd.up.ac/thesis/available/etd-08012005-171825.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Pretorius, Susan Mathilda. "Evaluation of the selection and breeding of Friesian horses in Southern Africa." Diss., University of Pretoria, 2003. http://hdl.handle.net/2263/26913.

Full text

Abstract:

In this study, the selection and breeding of Friesian horses in Southern Africa were evaluated. Literature was reviewed for sUbjective and objective selection criteria in horse breeding with special reference to the Friesian. 852 Pedigree records from Friesian horses registered at the FPSSA and SAFBA, were included for pedigree analyses and 232 horses were measured for eight different linear body measurements. Only 25,7% of the population was found to be inbred. A regression of average inbreeding on year of the whole population, indicated a relatively slow increase in the rate of inbreeding. It is, however, suspected that this could be a conservative estimation, because of the limited pedigree information. The results indicated that the Friesian horse is normally of rectangular (height at withers: body length) shape. A large average difference between wither height and back height was observed. The cannon length measurements were proportional to overall size, no obvious deviations were observed. Pearson correlation estimates between the eight body measurements were mostly in accordance with other studies on horses reported in the literature. A sire model was fitted for the estimation of heritability for wither-, back- and croup height, body length, cannon circumference and cannon length. Estimates ranged from 0.30 for wither height to 0.57 for cannon circumference. The results indicate that South African breeders can apply body measurements in their selection programs for Friesians. From the results, guidelines were provided for establishing a database for Friesian horses in Southern Africa to ensure a scientific approach to selection and breeding.
Dissertation (MSc (Agric))--University of Pretoria, 2003.
Animal and Wildlife Sciences
unrestricted

APA, Harvard, Vancouver, ISO, and other styles

19

Leiteritz, Teresa. "Untersuchung der Telomerenlänge und deren Einflussfaktoren bei monozygoten HF-Zwillingsrindern." Berlin dissertation.de, 2006. http://www.dissertation.de/buch.php3?buch=5272.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Al-Abri, Mohammed Ali. "Genetic variability of health disorders in Ontario Holstein cows." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112310.

Full text

Abstract:

Extensive emphasis on selection for milk yield with minimal attention to the animals' functional performance has increased the yield of North American dairy cattle. The high intensity of selection for production traits such as milk yield, protein yield and fat yield has also brought about a rapid increase in genetic relationships among animals. In dairy cattle, correlated response to selection for milk yield includes fertility and susceptibility to diseases. Although the high producing cows have greater net profit, they also have higher mammary and discarded milk costs associated with high production. Long-term genetic selection against clinically diagnosed diseases might be useful to diminish their incidence. The Scandinavian countries have incorporated the health traits into their selection indices. Canadian breeding programs realize the need to consider traits other than the yield in selection decisions. The objective of this study was to determine the genetic variability of various clinically diagnosed health traits. Data from 171 herds of the Ontario milk-recording program were used. These herds are collaborating with the University of Guelph (Dr. David Kelton) to record health traits. A major impediment to estimating heritabilities for the majority of the disorders was that the progeny group size per sire was not large enough to enable detecting a significant difference among sires. Hence, heritability estimates were not obtained for all the health disorders included in the study. The progeny group size per sire has to be increased such that there are at least 5 cases per progeny group to enable detecting a difference among sires. Heritability estimates for retained placenta and displaced abomasum in the first lactation were 0.067 and 0.212 respectively. The heritability estimate of cystic ovaries in the second lactation was 0.092. In the third lactation, the heritability estimate of mastitis was 0.10 whereas retained placenta had a heritability of 0.25.

APA, Harvard, Vancouver, ISO, and other styles

21

Ellingson, Terry Allen. "Digestion and utilization of nutrients in diets containing feather meal and (or) supplemental fat by lactating dairy cows." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09292009-020238/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Rumberia, Rufus Mburea. "The effect of theileriosis on the reproductive function of Boran/Friesian cross heifers." Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/29976.

Full text

Abstract:

This thesis describes studies that were undertaken to evaluate the effect of T.parva infection on the reproductive function of Boran/Friesian cross heifers. The study was conducted in four separate experiments. In Experiments 1 and 2, the animals were monitored for cyclical status post-infection. In Experiments 3 and 4, the infected animals were divided into two groups: one group was monitored for cyclical status and the other for both cyclical and pregnancy status after exposure to a bull. The reproductive function was assessed by routine monitoring of oestrous behaviour, palpation of the genital reproductive tract per rectum and determination of serum progesterone (P4) concentrations. Further, in view of observed acyclicity in the early work, attempts were made to assess the pituitary response to gonadotrophin releasing hormone (GnRH) in a group of animals (Ch.5) in an attempt to explain partly the mechanisms involved in the impairment. Animals were monitored for the progression of disease by clinical and parasitological responses. Further, subject to death or sacrifice, a macroscopic and histological examination of target and various other organs and tissues was undertaken in an effort to establish the part played by observable pathological changes in the development of impaired reproductive function. In Experiment 1, ten heifers were infected with 1:20 T.parva stabilate while four others remained as uninfected controls. Two of the infected animals died on days 17 and 29. Clinical reactions in the reovered animals ranged from mild to moderate. P4 profiles and ovarian structures revealed that three of eight recovered animals had luteal dysfunction post-infection although two of the three showed clinical oestrus during this particular period. The other five recovered animals cycled regularly. The results from clinical and pathological studies did not indicate any direct adverse effect of infection on reproductive function. All the four controls cycled throughout the study period.

APA, Harvard, Vancouver, ISO, and other styles

23

Pauly, Franka [Verfasser]. "Zusammenhang zwischen der Milcheinsatzleistung und der Tiergesundheit von Holstein-Friesian Kühen / Franka Pauly." Berlin : Freie Universität Berlin, 2021. http://nbn-resolving.de/urn:nbn:de:kobv:188-refubium-30972-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Ahmadzadeh, Amin. "Effect of naloxone on serum luteinizing hormone concentrations during the early postpartum period and the estrous cycle in primiparous and multiparous holstein cows." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-05092009-040533/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Filep, Renee. "In vitro milk protein secretion by explants of Holstein bull mammary tissue from two different genetic lines." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-06102009-063451/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Anggraeni, Anneke. "Productivity of Holstein-Friesian dairy cattle maintained under two systems in central Java, Indonesia." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430632.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Swali, Angelina. "Early development and subsequent metabolic and reproductive parameters in the Holstein-Friesian dairy cow." Thesis, Royal Veterinary College (University of London), 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416444.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Zhou, Jiang-Feng 1964. "PCR tests for the A- and B-alleles of k-casein and b-lactoglobulin in Holstein cattle." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56817.

Full text

Abstract:

Methodologies have been devised to genotype the $ kappa$-casein ($ kappa$-CN) and $ beta$-lactoglobulin ($ beta$-LG) loci using the polymerase chain reaction (PCR) and restriction fragment length polymorphisms (RFLPs) analysis. A fragment of 432 base pair from the $ kappa$-CN gene which contains the nucleotide substitutions diagnostic of the A- and B-alleles of $ kappa$-CN was amplified. DNA amplified from the A-variant contained a unique HinfI restriction site, whereas DNA amplified from the B-variant contained a unique TaqI site. Thus, the genotype of the animal could be determined by restriction enzyme analysis. A region extending from exon IV to V of the $ beta$-LG gene was also amplified using PCR. In this region, the B-allele contains 2 HaeIII restriction sites which are not present in DNA amplified from the A-allele. The digestion of the PCR product with HaeIII thus allowed discrimination between the A- and B-alleles. Analysis of bulls (n = 68) used by artificial insemination (AI) centres after 1980, bulls (n = 27) used before 1960, a random sample of male calves (n = 102) and cows (n = 123) revealed a frequency of the B allele of $ kappa$-CN as 0.13, 0.37, 0.22 and 0.19 in these populations, respectively. In the populations of bulls (n = 69) used by AI centres after 1980, bulls (n = 27) used before 1960, a random sample of male calves (n = 99), and cows (n = 129), the B-allele of $ beta$-LG was present at frequencies of 0.60, 0.52, 0.67, and 0.65, respectively. Statistical analysis of these data shows the frequency of the B-allele of $ kappa$-CN was significantly higher in sires (n = 27) which were used by the AI centre before 1960 compared to more modern proven sires (n = 68) (P $<$ 0.01).

APA, Harvard, Vancouver, ISO, and other styles

29

Schneider, María del Pilar. "Effects of type traits on herd life in Holstein cows." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21635.

Full text

Abstract:

The effect of composite and descriptive linear type traits on Functional Herd Life in Holstein cows was studied by means of Survival Analysis (Ducrocq and Solkner, 1998a). The original data set contained 331,105 lifetime records from the Programme d'Analyse des Troupeaux Laitiers du Quebec, from January 1980 to March 1995. Only 191,167 records (or cows) had type information. Mixed Weibull models were fitted to analyse the data; the probability of being culled (hazard) was defined as a product of a baseline Weibull hazard function and explanatory variables. The heritability estimates for Functional Herd Life were 0.07 in the log scale and 0.15 in the original scale. Sire Estimated Transmitting Ability for FHL, expressed as relative culling rate, ranged from 0.6 to 1.4 for all models. Solutions for fixed effects (all significant) indicated a higher probability of being culled for primiparous cows calving at older ages, for cows producing below herd average, for first lactation cows in the first and last stage of lactation and for older cows at the end of lactation. The risk of being culled did not change for cows in herds decreasing or increasing in size. Cows classified with a high score for Final Score were less likely to be culled; Final Score seems to be an important selection criteria among Quebec producers. Feet and Legs, Rump and Mammary System are traits that producers consider in their culling policies; cows classified with a high score had more chance of surviving. Among the linear type traits, the 5 traits with the highest impact on productive life, were Rear Attachment Height, Fore Attachment, Bone Quality, Stature and Fore Teat Placement; Quebec producers seem to consider these traits when they make their culling decisions.

APA, Harvard, Vancouver, ISO, and other styles

30

Beswick, Naomi Simone. "The influence of recombinant bovine growth hormone and growth hormone releasing factor on fat synthesis in primiparous Holstein cows." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq22570.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Scott, Graham Byron. "A study of the biomechanical factors involved in foot-floor interactions in Friesian cattle with reference to aspects of lameness." Thesis, University of Aberdeen, 1987. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=128451.

Full text

Abstract:

The forces and pressures applied to the hooves of Friesian cattle during gait were investigated using a combined force plate and pedobaroscope. Studies included those concerned with changes in loads and pressure with increasing live weight, flooring surface, stages of pregnancy and differences in gait with lameness. The forefeet carried significantly greater loads (i.e. equivalent to 60 per cent of body weight) than the hind feet (i.e. equivalent to 50 per of body weight), but no difference in load was observed between contralateral limbs. In most cases no significant difference was observed in contact area between feet. However with increasing live weight hoof-ground contact area increased at a rate exceeding that expected from allometry. The obtained relationship between area (A) and live weight (m) was A = 10.96 m^0.96. Pressure did not increase significantly with live weight. No significant decrease in contact area or increase in pressure was observed with a simulated slot, of 12 mm width, in the floor. During pregnancy the load distribution did not change significantly, though pressures were observed to increase slightly on all feet in the pre-partum period. The vertical ground reaction and horizontal fore and aft force-time curves of lame cows were different to those obtained from non-lame cows. The force-time curves of the non-lame limbs of the lame cattle were also modified. It was concluded that the heel region was compressed of the inter-digital space increased to increase the solear ground contact with increasing load, to reduce applied pressure. This would reduce the risk of pressure-induced injury and lameness. The load distribution during pregnancy did not explain the higher incidence of lameness on the hind feet at this time and other factors may be implicated. Changes in applied forces on limbs with lameness may act to alleviate pain. The forces applied to the non-lame limbs may compensate for the change in load on the lame foot or act to further alleviate pain. Further work is suggested to relate the risk of injury and lameness on different floor types to the applied loads and pressures.

APA, Harvard, Vancouver, ISO, and other styles

32

Drake, Dawn M. "Connections between mastitis and climate a study of holsteins on pasture in Northampton County, Pennsylvania /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 186 p, 2008. http://proquest.umi.com/pqdweb?did=1597631411&sid=43&Fmt=2&clientId=8331&RQT=309&VName=PQD.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Kromik, Andreas [Verfasser]. "Kausale Charakterisierung der Bovinen kongenitalen Vertebro-Spinalen Dysplasie in der Holstein-Friesian Population / Andreas Kromik." Hannover : Bibliothek der Tierärztlichen Hochschule Hannover, 2015. http://d-nb.info/1072796074/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Cromie, Andrew Robert. "Genotype by environment interaction for milk production traits in Holstein Friesian dairy cattle in Ireland." Thesis, Queen's University Belfast, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287404.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Jensen, Rebekah Paige. "Plane of Energy Nutrition on Blood Metabolites, Milk Production and Lamb Growth in Friesian Sheep." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6857.

Full text

Abstract:

Small ruminant species are utilized for their diverse products including meat, dairy products, and wool. Effective and humane management are essential to maintain high production rates and comfortable animals. To attain this objective, managers needs to have an extensive knowledge of husbandry techniques, understanding of physiological processes, and familiarity with nutritional requirements. We examined the effects of varying feed components on two different ruminal species. In Chapter 1, we conducted a study to evaluate"¯the effects"¯of a low metabolizable energy (LME) and high metabolizable energy (HME) diet on twenty-two Friesian/Lacuane"¯cross ewes and lamb nutritional status."¯Effects on milk production during early lactation stages"¯and the growth of the neonatal lambs were also investigated. We anticipate energy levels will have an effect on milk production and lamb growth. Our results indicate that ewes on the LME diet produced more milk with higher concentrations of fat though this group maintained lower body condition. We concluded that neither the HME nor the LME diet met the needs of the sheep due to the shift in nutrient partitioning towards milk production rather than allocating nutrients to maintaining both body condition and milk production. Limited energy requirements are further evidenced by the decline in back fat (BF) for both the HME and LME groups for the duration of the study. We determined the degradation parameters of grass hay supplemented with soybean meal (SBM) and the effects of SBM on compartment 1 (C1) ammonia and volatile fatty acid (VFA) concentrations in alpacas. Our findings show that the degradation rate was not different for dry matter (DM), but it was for crude protein (CP) (P<0.05). With this data it can be concluded that SBM can be a CP supplement when the diet is insufficient to improve microbial yield. It should be noted that care should be taken to avoid causing a protein-energy imbalance. The results of these two studies indicate shifts in nutrients availability and changes in feeding strategies can affect both the health of the animal and their subsequent offspring.

APA, Harvard, Vancouver, ISO, and other styles

36

Saeed, Sheikh Abdul. "Studies on steroidogenic, follicular and ovulatory responses to exogenous gonadotrophins in Hereford x Friesian heifers." Thesis, University of Aberdeen, 1988. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602259.

Full text

Abstract:

This study was designed to investigate the locus of action of different gonadotrophins on the stimulation of multiple follicular development and superovulation in heifers. In addition follicular populations and steroiodogenic potential of the follicles (>10 mm diameter) at different stages of the superovulatory treatment were studied. Experiment 1 was carried out to investigate the effect of three gonadotrophins (pregnant mare serum gonadotrophin, PMSG; human menopausal gonadotrophin, hMG-Pergonal 75 i.u. FSH, 75 i.u. LH per ampoule; and urofollitrophin UF-Metrodin 75 i.u. FSH per ampoule) on multiple follicular development and hormonal profiles. Experiments 2 and 3 were designed to study follicular populations and steroiodogenic potential of the follicles in superovulated heifers and to compare these parameters with control heifers.

APA, Harvard, Vancouver, ISO, and other styles

37

Raschke, Karolin. "Erarbeitung eines Schemas zur Beurteilung der Körperkondition von Kälbern der Rassen Deutsches Fleckvieh und Holstein Friesian." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-73936.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Raschke, Karolin. "Erarbeitung eines Schemas zur Beurteilung der Körperkondition von Kälbern der Rassen "Deutsches Fleckvieh" und "Holstein Friesian"." [S.l.] : [s.n.], 2007. http://edoc.ub.uni-muenchen.de/archive/00007393.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Körte, Juliane. "Farbdopplersonographische Studien zur uterinen Blutversorgung in der zweiten Hälfte der Gravidität bei laktierenden Holstein-Friesian-Kühen." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=985255498.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Gilmore, Hazel S. "An investigation of factors affecting reproductive function in the high genetic merit holstein-friesian dairy cow." Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.534737.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Ehlert, Jeannine [Verfasser]. "Untersuchungen zu den Konzentrationen an Mengen- und Spurenelementen im Harn von Holstein-Friesian Milchkühen / Jeannine Ehlert." Berlin : Freie Universität Berlin, 2016. http://d-nb.info/110417068X/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Müller, Marc-Philipp [Verfasser], and Ivica [Akademischer Betreuer] Međugorac. "Molekular- und populationsgenetische Untersuchungen zur Fruchtbarkeit der Rinderrasse Holstein-Friesian / Marc-Philipp Müller. Betreuer: Ivica Međugorac." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2016. http://d-nb.info/1088318223/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Ageeb, Abdel Gadir Ahmed. "Genetic relationships among feed intake measures, feed conversion efficiency, and milk production traits in Holsteins using field recorded data." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35555.

Full text

Abstract:

A total of 114,351 Holstein first lactation records collected by the Quebec Dairy Herd Analysis Service (DHAS-PATLQ) between September, 1979 and January, 1994 were used to study the effects of adjusting records for linear and quadratic effects of 90- and 305-d feed intake measures (total energy, total protein and total dry matter) on estimation of heritabilities of and genetic correlations among yield and composition traits. Genetic parameters of feed intake measures, relationships between feed intake and age and weight at calving, and feed conversion efficiency traits were also examined in a series of studies. A sire model fitted by REML estimated heritabilities of 305-d milk, fat and protein yields, fat and protein percents as .45 +/- .04, .48 +/- .04, .44 +/- .03, .92 +/- .06, and .88 +/- .05, respectively. Correction of 305-d records for differences among cows in feed intake levels reduced heritabilities of milk, fat and protein yields to .35 +/- .03, .52 +/- .04, and .38 +/- .03, respectively. Heritabilities of composition traits (fat and protein percents) remained unchanged. Genetic and phenotypic correlations for yield traits were also reduced (48--170%, and 16--51%, respectively) which may indicate that genetic associations between yield traits are less than what we believed them to be. Heritabilities of 305-d total energy, total protein, total DM intake, grain energy, grain protein, grain DM, base energy, base protein, and base DM were .30 +/- .03, .24 +/- .02, .35 +/- .03, .23 +/- .02, .23 +/- .02, .23 +/- .02, .31 +/- .03, .26 +/- .02, and .40 +/- .03, respectively. Genetic correlations between feed intake measures were very high; they were approaching unity in some cases. Therefore, any one of these feed intake measures can represent the others. A multi-trait REML analysis estimated heritabilities of age and weight at first calving as .11 +/- .01 and .37 +/- .03, respectively. Age at calving was negatively associated with yield traits and with total e

APA, Harvard, Vancouver, ISO, and other styles

44

Jairath, Lalit Kumar. "Genetic and phenotypic parameters of lifetime performance traits in Canadian Holsteins." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39424.

Full text

Abstract:

Estimates of genetic and phenotypic parameters of lifetime performance traits and estimates of correlations between these and first lactation traits were obtained using multitrait mixed model and Restricted Maximum Likelihood (REML) methodologies, and accounting for all known additive genetic relationships amongst animals in sires pedigree. Part-lifetime performance traits, i.e. two-, three, and four-parity totals of yield and profit, were also included in the analysis. Data were on 82,835 Holstein cows, daughters of 703 sires, calving first between September 1979 and December 1984 in the herds enrolled in Quebec Dairy Herd Analysis Service (QDHAS). Lifetime performance records, however, continued through December 1989.
Results of analysis indicated low estimates of heritability for lifetime performance traits, e.g., lifetime production and profit (.11$ sim$.13) and longevity (.07$ sim$.09). However, production per day of productive life traits had moderate heritability (.28$ sim$.32). Estimates of genetic and phenotypic parameters decreased from part-lifetime to total lifetime performance because residual variances increased at a greater rate compared to rate of increase in sire variances. Both genetic and phenotypic correlations amongst lifetime production, lifetime profit and longevity traits were very high and approached unity in all cases.
Estimates of genetic and phenotypic correlations of first lactation production and profit traits with all measures of part and total lifetime performance were positive and high. These correlations decrease from part-lifetime to total lifetime performance due to part to whole relationships.
Estimates of parameters of lifetime performance traits were mostly free of the effects of selection on milk production. Positive and high genetic correlation of first lactation milk yield with all lifetime performance traits indicated that selection on first lactation milk yield alone will improve all measures of lifetime performance. However, some consideration should be given to measures of reproduction and health which may help in improving the longevity of dairy cattle. (Abstract shortened by UMI.)

APA, Harvard, Vancouver, ISO, and other styles

45

Masoudi, Mehrnoush. "Identification of variants within the coding region and 5'-flanking region of the k-casein encoding gene in Holsteins using PCR-RFLP and PCR-SSCP analyses." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23409.

Full text

Abstract:

Single-strand conformation polymorphism analysis (SSCP) and restriction fragment length polymorphism analysis (RFLP) were used to determine the genotype of Holsteins at the $ kappa$-casein ($ kappa$-CN) locus. A 432-bp fragment within exon IV containing nucleotide substitutions diagnostic of the A- and B-variants of $ kappa$-CN was amplified using the polymerase chain reaction (PCR). The sires from the earliest years of the AI industry had a significantly higher (p $<$ 0.01) frequency of allele than sires in modern usage. These data indicate that selection or milk production parameters may discriminate against the B-allele. SSCP analysis was also used for detecting polymorphisms within the regulatory region of $ kappa$-CN gene. A 640-bp fragment within the 5$ sp prime$-flanking region of bovine $ kappa$-CN gene which contained the TATA box, CAAT box, and exon I was amplified using PCR. The SSCP analysis of this fragment revealed no variation, possibly due to the lower detection efficiency of SSCP with large fragment size. Nested primers were, therefore, designed to amplify fragments of 234- and 486-bp. Polymorphism was detected only in the 486-bp fragment and the two variants were designated M$ sb1$ and M$ sb2.$ The allelic frequencies of M$ sb1$ and M$ sb2$ in bulls used by AI industry before 1970 were 0.67 and 0.33, and in bulls used by AI industry after 1980 the frequencies were 0.68 and 0.32, respectively. The frequency of these alleles were not significantly different in Holsteins used by AI industry before 1970 and after 1980. Unlike the apparent change in frequency of the A- and B-variants noted within exon IV, this polymorphism seems to have not responded to selection. However, a higher frequency of M$ sb1$ allele appeared to be associated with B-variant (exon IV) genotypes. The presence of these variants within the regulatory region may possibly be involved in the quantitative expression of $ kappa$-CN gene. (Abstract shortened by UMI.)

APA, Harvard, Vancouver, ISO, and other styles

46

Li, Suiyang. "Establishment of an inbreeding index in Holstein dairy cattle using DNA fingerprinting." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69763.

Full text

Abstract:

In order to establish a method of assessing the degree of inbreeding within herds of cattle, we constructed a calibration index relating kinship and the degree of DNA band sharing in DNA fingerprints. Firstly, chickens were used as a model system to test the possibility of using microsatellite DNA as a probe for DNA fingerprinting in inbreeding analysis. Six genetic groups of chickens with estimated coefficients of inbreeding ranging from 0.026 to $>$ 0.98 (pedigree analysis) were fingerprinted using the minisatellite probe derived from M13 and the microsatellite probe (CAC)$ sb5$. The degree of band sharing using either probe increased in concert with the known amount of inbreeding and was described by the equation Y = 0.56X ($ pm$0.06) + 0.42 ($ pm$0.03); r = 0.998. Since in-gel hybridization using the microsatellite probes was faster and less labour intensive than using the minisatellite probe, it was used in the subsequent studies. Pedigree analysis in Holstein dairy cattle allowed for the empirical calibration of the association of band sharing with the coefficient of relatedness, (r), defined as the expected proportion of genes in 2 individuals that are identical by descent (i.e. for monozygous twins r = 1; for first order relatives r = 0.5; for half sibs r = 0.25 etc.). The average band sharing between pairs (6 pairs at each r value) of individuals within each class formed the basis for calibration. DNA was digested using RsaI. The relationship between band sharing and relatedness was well represented by a linear approximation Y = 0.51X ($ pm$0.09) + 0.50 ($ pm$0.04); r = 0.992. Using this calibration curve, random samples of animals within herds can be tested to establish the herd variability and to minimize inbreeding.

APA, Harvard, Vancouver, ISO, and other styles

47

Neu-Zuber, Anna. "Myoelektrische Aktivität von Labmagen und proximalem Duodenum bei Milchkühen : Langzeituntersuchungen unter Berücksichtigung verschiedener endogener und exogener Einflussfaktoren /." Wettenberg : VVB Laufersweiler, 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015471714&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Moro-Méndez, José. "Associations between genetic markers and mastitis resistance in Canadian Holsteins." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85943.

Full text

Abstract:

The objective of this thesis was to test for associations between genetic polymorphisms of genes related to immune response (growth hormone (GH), growth hormone receptor (GHR), ornithine decarboxylase (ODC), insuline-like growth factor-1 (IGF-1), adrenocorticotropin hormone (ACTH), corticotrophin releasing hormone (CRH), and prolactin (PRL)) and mastitis resistance traits (incidence of clinical mastitis (ICM), occurrence of clinical mastitis (OCM), culling due to mastitis (CDM), and somatic cell scores (SCS)) in Canadian Holsteins.
Using lactation records of cows enrolled in milking recording in Quebec (Programme d'Analyse des Troupeaux Laitiers du Quebec, PATLQ from 1980 to 1994 (411,291 first, 238,432 second, and 130,983 third lactations, respectively) Estimated Transmitting Abilities of traits were generated with a model that included the random effect of sire, and fixed effects of herd-year-season-of calving, age at calving, and genetic group. 721 bulls which had daughters in the phenotypic data sets were genotyped for twenty polymorphisms of the above genes located on autosomes (BTA) 5, 11, 14, 19, 20, and 23.
Two types of analysis of associations were performed: analysis across-population with a model that included the fixed effect of marker and random effect of the son of grandsire, and within-family analysis with a model that included the fixed effects of the grandsire, marker nested within grandsire, and the random effect of son nested within marker and grandsire. Permutation tests were performed to reduce Type I error probability.
Significant associations were found within families for markers of IGF-1 (BTA5), ODC (BTA11), GH (BTA 19), GHR (BTA 20), and PRL (BTA 23) for ICM, OCM, CDM, and SCS in different lactations. Some of these putative quantitative trait loci (QTL) are located on BTA where other authors have reported QTL affecting SCS and udder conformation. The results from this study may contribute to efforts to dissect the genetic basis of mastitis resistance in dairy cattle.

APA, Harvard, Vancouver, ISO, and other styles

49

Brömmling, Anne [Verfasser]. "Ovarieller Einfluss auf die Involution und Inflammation des Uterus im Puerperium von Holstein Friesian Kühen / Anne Brömmling." Hannover : Bibliothek der Tierärztlichen Hochschule Hannover, 2012. http://d-nb.info/1024342298/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Lange, Katrin Susanne [Verfasser]. "Calving prediction and evaluation of calving ease after medical treatment in Holstein-Friesian heifers / Katrin Susanne Lange." Berlin : Freie Universität Berlin, 2020. http://d-nb.info/1221130056/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!