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Tesis sobre el tema "Cattle Breeding"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de julio de 2025

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1

Skrypzeck, Heidi. "An assessment of the contributions of Afrikaner, Hereford and Simmentaler in composite breed development in beef cattle." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51591.

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Thesis (MScAgric)--University of Stellenbosch, 2000.<br>ENGLISH ABSTRACT: The objective of this study was to obtain more information regarding the characterisation of Afrikaner (A), Hereford (H) and Simmentaler (S) breeds in an initial crossbreeding programme and subsequent composite development. This involves the estimation of breed additive effects, breed maternal, individual heterotic effects and maternal heterotic effects in the initial crossbreeding phase and the estimation of genetic parameters and prediction of breeding values in later generations for birth weight (BW), weaning we

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2

Matjuda, Lehotlo Ephraim. "Development breeding objectives for the nguni cattle breed in South Africa." Thesis, University of Limpopo (Turfloop Campus), 2012. http://hdl.handle.net/10386/862.

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3

Afolayan, Raphael Abiodun. "Genetics of growth and development in cattle." Title page, table of contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09pha2579.pdf.

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4

Mazhar, Kehkashan. "Molecular genetic markers for selection and genome mapping in cattle." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260797.

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5

Meacham, Nancy S. "Heritability estimates for calving date in Simmental cattle." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45782.

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Variation among sires in daughters' reproductive performance was analyzed using data on 4,360 cows from nine herds obtained from the American Simmental Association. Cows were required to have at least 50% Simmental breeding, to have calved first at 2 yr of age and to have been born and subsequently calved in the same herd and season. Traits analyzed included first and second calving dates, first calving interval and the percentage of cows that returned to calve in the same season as 3-yr-olds. Data were adjusted for effects of percentage Simmental and first-calf calving ease score. At secon

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6

Brown, Timothy P. (Timothy Phillip). "Selection indices in retrospect for dairy cattle." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59266.

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Selection differentials and selection indices in retrospect were calculated to determine the relative emphasis placed on production and type traits through bull selection. Indices in retrospect including only production traits indicated that, for Holsteins, fat yield was the trait most heavily selected for between 1978 and 1987, followed by protein percent and then milk yield. Fat percent and protein yield had negative index weights throughout the nine year period. In Ayrshires, similar weights were observed except that milk yield index weights were negative throughout the nine year period. It

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7

Green, Ronald T. "Evaluation of optimum and near optimum pair selection methods for increasing predicted relative net income in Jersey cattle." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45650.

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<p>To evaluate the importance of non-linear relationships between Relative net income per day of productive life (RNI/DPL) and individual traits, 921,915 potential offspring were simulated from all possible matings of 20,487 Jersey cows and 45 active AI sires. Predicted milk yield, fat yield, and 13 linear type traits of potential progeny were used to predict RNI/DPL of all potential progeny.</p> <p> Five methods of mate selection and pairing were evaluated for their effectiveness in choosing mates and the amount of computer time required to choose those pairings. Results of a linear p

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8

Mitchell, Jay Douglas. "An Economic Assessment of Genetic Information: Leptin Genotyping of Breeding Cattle." Thesis, North Dakota State University, 2006. https://hdl.handle.net/10365/29904.

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Recent studies show polymorphisms in the leptin gene significantly impact milk production in dairy cattle. If the leptin gene were to have a similar impact on beef cattle, calf weaning weights would be expected to increase from the increased milk production in the cows. Since weaning weight is a key component of profitability in a cow-calf operation, leptin genotyping may prove to have an economic impact in breeding cattle. However, no research has been done to link the economic impact of increased milk production to breeding cattle. Using 595 observations from genotyped cows spanning 11 years

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9

Botha, Theunis Christoffel. "Effect of selected physical and production traits on the tick burdens of beef cattle." Thesis, Port Elizabeth Technikon, 2002. http://hdl.handle.net/10948/91.

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The objective of this study was to determine the effect of selected traits such as age, sex, body weight, body length and height, body condition score (BCS), coatscore (CS), skin thickness and average skin surface temperature on tick burdens in beef cattle. Bonsmara cattle (n= 143) were used to measure visible tick counts, body condition score, coat score, skin thickness, body height and length, body weight, body surface temperature, gender and inter calving period. Measurements were taken from April to December. All animals were managed extensively on natural and cultivated pastures near Geor

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10

Gotschi, Manuela. "The use of blood metabolic concentrations as indicators of the metabolic and productive status in dairy cows." Diss., Pretoria : [s.n.], 2000. http://upetd.up.ac.za/thesis/available/etd-01312008-145827.

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11

Hossain, Khandaker Bayazid. "STATISTICAL GENETIC STUDY ON CATTLE BREEDING FOR DAIRY PRODUCTIVITY IN BANGLADESH." Kyoto University, 2000. http://hdl.handle.net/2433/151599.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第8568号<br>農博第1151号<br>新制||農||810(附属図書館)<br>学位論文||H12||N3447(農学部図書室)<br>UT51-2000-M32<br>京都大学大学院農学研究科応用生物科学専攻<br>(主査)教授佐々木義之, 教授守屋和幸, 教授矢野秀雄<br>学位規則第4条第1項該当

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12

Perotto, Daniel. "Additive and nonadditive genetic effects on growth and milk production traits in Holstein Ayrshire crossbreeding experimental data." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70266.

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Crossbreeding parameters (additive (a), dominance (d) and additive x additive (aa) epistatic effects for individual $ sp{ rm (I)}$ and for maternal $ sp{ rm (M)}$ performance) on body weight growth and first lactation performance traits of females from a crossbreeding experiment between Holstein (H) and Ayrshire (A) based lines were estimated by individual animal models, incorporating all known additive genetic relationships amongst animals, through restricted maximum likelihood and mixed-model methodologies.<br>The growth traits (asymptotic weight (A), rate parameter (k), inflection parameter

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13

Sinclair, Kevin D. "Metabolism in cattle and regulation of anterior pituitary hormone release." Thesis, University of Aberdeen, 1996. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU079035.

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Experiments were designed to assess the effects of energy and protein intake on metabolic function and reproductive efficiency in single and twin suckling beef cows and heifers. A role was proposed for endogenous opioid peptides in mediating the effects of photoperiod, suckling and nutrition on anterior pituitary hormone release, and tested with respect to nutrition. The first two experiments were designed to quantify the effects of pre- and post-partum energy and protein intake, on milk yield and composition, body tissue mobilisation, the post-partum anoestrous interval, and subsequent concep

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14

Ulutas, Zafer. "Production traits and market values of Welsh black cattle." Thesis, Bangor University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262765.

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15

Diaz-Martin, Clara. "Correlation of predicted breeding values across environments in the presence of selection for direct and maternal breeding values." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/39438.

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A simulation approach was used to determine the effects of multitrait selection on the correlations of sire direct and maternal predicted breeding values across environments. True and predicted direct and maternal breeding values (BV) of sires were simulated for sires evaluated independently in two different environments. Prediction error variances and covariances among direct and maternal BV within environments were required for the simulation. To obtain the necessary input parameters, a variety of MME coefficient matrices were created and inverted to inspect relationship among accuracies and

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16

Todd, Darren Lindsay. "Implementation of genomic selection in UK beef and sheep breeding." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8766.

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Genomic selection (GS) has been adopted by the dairy cattle breeding industry and the opportunity exists to implement this technology in UK beef and sheep breeding. However, these sectors do not appear so readily predisposed to GS implementation. Following an introduction to GS in Chapter 1, Chapter 2 investigated the structure of the little-studied UK beef breeding sector. This provided estimates of key commercial and pedigree population parameters, for use in modelling genetic gain from GS. Terminal traits were found to be the dominant selection goals, with 85% of beef-sired commercial matin

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17

Tosi, Hugo Ricardo. "Dairy cattle breeding performance when grazing the high protein pastures of Uruguay." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ35047.pdf.

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18

Shadwick, Mark. "An investigation of the MLC beef bull index." Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386691.

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19

Persson, Ylva. "Breeding soundness evaluation of young beef bulls /." Uppsala : Dept. of Clinical Sciences, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200718.pdf.

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20

Hird, Wendy Louise. "The effect of milk pricing on genetic selection goals in British Columbia and Quebec dairy cattle populations." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24683.

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This study has compared the effect of milk pricing systems on the selection goals of dairy producers in two provinces of Canada, British Columbia (BC), and Quebec. These provinces were chosen for comparison as BC produces milk largely for a fluid market, while Quebec produces milk for a manufacturing market. Within BC, due to a higher utilization and higher milk price, the value/kg of skim on Vancouver Island was higher than that of the Vancouver Lower Mainland over the study period 1963-1982. Between the two provinces, the value/kg of skim in BC was found to be consistently higher than in Que

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21

Nugent, Russell Arthur. "Analysis of newborn calf body measurements and relationship of calf shape to sire breeding values for birth weight and calving ease." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07282008-135956/.

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22

Skinner, John. "A dairy cattle breeding and management computer simulation program for teaching and research." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26076.

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The increased power and availability of computers has resulted in an increase in the value of simulation as a means of furthering our understanding of systems. Reducing the components and interactions of a system to mathematical models enables simulation to provide a clear basis of the system and this can be useful for teaching and research. Simulation is especially suited for studying genetic gain in dairy cattle because there are already reliable mathematical models available. Analyzing genetic gain in practice is difficult due to the numerous and diverse factors that affect it. This projec

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23

Stella, Alessandra. "Strategies for applying marker assisted selection in nucleus breeding schemes in dairy cattle." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ56295.pdf.

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24

Holgate, Katheryn T., and University of Lethbridge Faculty of Arts and Science. "The effects of cattle grazing on the breeding biology of riparian forest birds." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 1999, 1999. http://hdl.handle.net/10133/349.

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Cattle grazing in riparian zones can have large impacts on vegetation characteristics and avian biodiversity. To assess these impacts in southern Alberta, vegetation and bird surveys were conducted in twelve riparian sites (four each in heavily grazed, moderately grazed, and ungrazed habitats) along the Oldman River. The shrub understory and bird species diversity and abundance declined significantly as grazing intensity increased. Settlement patterns, territory sizes, and food provisioning rates of some bird species were examined to assess the mechanisms behind this reduction. Five out of sev

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25

Krebs, Elizabeth Ann. "Reproduction in the cattle egret (Bubulcus ibis ibis) : the function of breeding plumes." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60507.

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This study investigates the colonization of Barbados, the seasonality of breeding, and the function of breeding plumes in the cattle egret Bubulcus ibis ibis. Colonization occurred around 1956, and the island now has 4 colonies. Numbers of birds at each colony are still increasing. Colonies are evenly spaced around the island. Plumage scores varied seasonally, and males had higher scores than females. Breeding activity peaked in July-August and November-March. Conspecific interference may force poorly plumed birds to breed when environmental conditions are poor. Chick mortality was primarily f

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26

Mrode, Raphael Aweyevu. "Genetic response to selection for rate and efficiency of lean gain in beef cattle." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/15445.

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27

Mogale, Moneri Sanah. "The use of indigenous knowledge in beef cattle husbandry in Tshebela Village, Limpopo Province." Thesis, University of Limpopo, 2017. http://hdl.handle.net/10386/1959.

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Thesis (M. Dev.) -- University of Limpopo, 2017<br>There is a gap in the literature about the role and relevance of Indigenous Knowledge and beef cattle welfare in many parts of the Limpopo province. This gap is relevant because many marginalised cattle owners use indigenous knowledge in their day to day management of beef cattle. The aim of the study is to investigate the use of IK methods on beef cattle husbandry in Tshebela village in the Capricorn district of the Limpopo province as a contribution to filling the void identified above. The objectives of the study were as follows:  -To inv

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28

Sianangama, Pharaoh Collins. "Effects of human chorionic gonadotropin administration at various times following breeding on corpus luteum number, diameter, progesterone profiles and pregnancy rates in dairy cattle." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28745.

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Corpus luteum (CL) dysfunction has been implicated among various factors predisposing early embryonic mortality in cattle. Two experiments were conducted to evaluate the efficacy of using human chorionic gonadotropin (hCG) given either at the time of breeding (day 0) , day 7 or 14 post breeding, in reducing that component of early embryonic mortality caused by CL dysfunction. The aims of experiment 1 were to investigate the effectiveness of using hCG, in inducing the development of accessory CL, their formation and growth, and the effect of such treatments on the function of both the induced a

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29

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.

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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

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30

Kearney, John Francis. "Incorporation of new techniques in animal breeding programmes, with an emphasis on dairy cattle." Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/28328.

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A study of the inbreeding of UK Holstein cows was undertaken to assess the current levels and trends in inbreeding in this breed. Results showed that inbreeding has increased at a rate of 0.17% per year and it continues to increase in a linear fashion. Optimisation procedures, which have been developed to maximise the rate of genetic gain at a predefined rate of inbreeding, were applied to determine is such procedures would be useful in a dairy cattle context. The results showed that the procedures were able to generate more genetic gain at current rates of inbreeding or alternatively to reduc

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31

Boukha, Aziza. "Genetic aspects of beef quality in Piemontese cattle and relations with breeding goal traits." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425501.

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The Piemontese breed is highly specialized for beef production due to double muscling (DM) inherited condition induced by a specific mutation of Myostatin gene (mh) located on Chromosome 2. This phenotype is characterized by greater muscle mass with less fat deposition, reduced weight of the skeleton reduced feed intake, and improved feed conversion. The current breeding goal of the Piemontese population includes traits related to quantitative beef production and maternal calving performance of animals. This thesis is aimed to study the possibility to introduce, indirectly, meat quality trai

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32

Tauck, Shaun Austin. "Factors associated with the biostimulatory effect of bulls on resumption of ovarian cycling activity and breeding performance of first-calf suckled beef cows." Thesis, Montana State University, 2005. http://etd.lib.montana.edu/etd/2005/tauck/TauckS0505.pdf.

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33

Brown, Christopher Mark. "The application of recently developed techniques to Welsh Black Cattle in a group breeding scheme." Thesis, Bangor University, 1990. https://research.bangor.ac.uk/portal/en/theses/the-application-of-recently-developed-techniques-to-welsh-black-cattle-in-a-group-breeding-scheme(01ac6838-eb2d-4b05-9927-01574b3b68e2).html.

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Methods of superovulation, embryo recovery and embryo transfer were adapted and developed for application to Welsh Black cattle in a Group Breeding scheme. Three methods of oestrus detection in early postpartum suckling beef cows were evaluated. None was entirely reliable although a probe for the measurement of the electrical resistance of vaginal mucus was the most effective and the least stressful. The postpartum interval to superovulation did not affect the responses to treatment. The effect of suckling on embryo quality from superovulated Welsh Black cows was investigated. Three groups of

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34

Ouma, Emily Awuor [Verfasser]. "Economic valuation of phenotypic cattle trait preferences in trypanosomosis prevalent production systems of Eastern Africa : implications for sustainable cattle breeding programs / Emily Awuor Ouma." Kiel : Universitätsbibliothek Kiel, 2008. http://d-nb.info/1019631376/34.

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35

Almeida, Rodrigo de. "Study of abnormal test-days in Quebec Holstein cows." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23995.

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The influences of some environmental and genetic factors on the incidence of abnormal test-days in milk-recorded cows enrolled in the Quebec Dairy Herd Analysis Service (QDHAS) was determined in this study. Conditions Affecting Records (CAR) codes, collected monthly by QDHAS's supervisors, are possible explanation for a reduced production in the day of test. For the purpose of this study, CAR codes were used to analyze the incidence of health problems under generalized linear models methodology. Poisson and logistic regression model analyses were able to model the number of cases of abnormal t

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36

Do, Changhee. "Improvement in accuracy using records lacking sire information in the animal model." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/39430.

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37

Ilatsia, Evans D. [Verfasser], and Zárate Anne [Akademischer Betreuer] Valle. "Breeding strategies for Sahiwal cattle genetic resources in Kenya / Evans D. Ilatsia. Betreuer: Anne Valle Zárate." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2011. http://d-nb.info/1027291856/34.

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38

Williams, Anwen. "The use of herd data to teach dairy cattle breeding in further and higher education contexts." Thesis, Bangor University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421675.

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39

Ahmad, Sausan. "Application of BLUP in prediction of breeding values and estimation of SNP effects in dairy cattle." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/12006/.

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Genetic selection for higher milk production has unavoidably resulted in a decline in fertility of dairy cattle in the UK due to the antagonistic correlation existing between fertility and milk yield. This trend in fertility has necessitated broadening the breeding programme to include fertility traits. However, the heritability of fertility traits currently used in the UK are of low heritability (h2<0.05). Therefore, one approach is to use molecular markers in order to identify animals with the highest genetic merit for fertility. The first aim of this project was therefore to test single nuc

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40

Schierenbeck, Sven Verfasser], Henner [Akademischer Betreuer] [Simianer, and Hermann [Akademischer Betreuer] Swalve. "Controlling of dairy cattle breeding programs / Sven Schierenbeck. Gutachter: Henner Simianer ; Hermann Swalve. Betreuer: Henner Simianer." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2012. http://d-nb.info/1043765387/34.

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41

Espigolan, Rafael [UNESP]. "Parametric and semi-parametric models for predicting genomic breeding values of complex traits in Nelore cattle." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/149846.

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Submitted by RAFAEL ESPIGOLAN (espigolan@yahoo.com.br) on 2017-03-17T22:04:14Z No. of bitstreams: 1 Tese_Rafael_Espigolan.pdf: 1532864 bytes, checksum: c79ad7471b25137c47529f25762a83a2 (MD5)<br>Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2017-03-22T12:50:50Z (GMT) No. of bitstreams: 1 espigolan_r_dr_jabo.pdf: 1532864 bytes, checksum: c79ad7471b25137c47529f25762a83a2 (MD5)<br>Made available in DSpace on 2017-03-22T12:50:50Z (GMT). No. of bitstreams: 1 espigolan_r_dr_jabo.pdf: 1532864 bytes, checksum: c79ad7471b25137c47529f25762a83a2 (M

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Espigolan, Rafael. "Parametric and semi-parametric models for predicting genomic breeding values of complex traits in Nelore cattle /." Jaboticabal, 2017. http://hdl.handle.net/11449/149846.

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Orientador: Lucia Galvão de Albuquerque<br>Coorientador: Daniel Gustavo Mansan Gordo<br>Banca: Lenira El Faro Zadra<br>Banca: Ricardo Vieira Ventura<br>Banca: Danisio Prado Munari<br>Banca: Gerardo Alves Fernandes Júnior<br>Resumo: O melhoramento genético animal visa melhorar a produtividade econômica das futuras gerações de espécies domésticas por meio da seleção. A maioria das características de interesse econômico na pecuária é de expressão quantitativa e complexa, isto é, são influenciadas por vários genes e afetadas por fatores ambientais. As análises estatísticas de informações de fenóti

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43

Rosati, Giulio. "Design, characterization and validation of an innovative biosensor for illegal hypertrophy treatments detection in cattle breeding." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424204.

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The work done during this PhD program, and presented in this thesis had the goal to design, develop and characterize a system for the detection of illegal anabolic treatments in cattle breeding, independently from the particular anabolic substance used. The system is aimed to allow for faster and cheaper controls with respect to standard techniques such as mass spectrometry, gas chromatography, and histological exams. Moreover, the system allows for on-the-field controls, drastically reducing the costs related to sample transportation, analysis, and trained personnel. The main strength of thi

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44

Holm, Dietmar Erik. "The economic effects of an oestrus synchronisation protocol using prostaglandin and reproductive tract scoring in beef heifers in South Africa." Electronic thesis, 2006. http://upetd.up.ac.za/thesis/available/etd-05042007-162414/.

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45

Yilmaz, Ahmet. "VARIANCE COMPONENT ESTIMATION FOR REPRODUCTIVE TRAITS AND ANALYSES OF MYOFIBRILLAR PROTEINS AND AGE AT PUBERTY IN ANGUS BEEF CATTLE DIVERGENTLY SELECTED FOR BLOOD SERUM INSULIN-LIKE GROWTH FACTOR I CONCENTRATION." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1041608790.

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46

Strasser, Mark. "The development of a fuzzy decision-support system for dairy cattle culling decisions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29794.pdf.

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47

Archer, Alfred Ainsley. "A framework to integrate and analyse industry-wide information for on-farm decision making in dairy cattle breeding /." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36749.

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The goal of this thesis was to develop a framework that could integrate and analyse industry-wide information for the support of on-farm decision-making in dairy-cattle breeding. Specific objectives included (i) describing a dairy breeding information system (DBIS); (ii) examining how the Internet could be exploited to improve the DBIS and its functioning; (iii) describing a process for implementing a unified data model to facilitate integrated user access to information in the DBIS; and (iv) developing software to support decision-making by facilitating access to a unified data model when imp

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Mashiloane, Majela Lesley. "Effect of selection at weaning on genetic parameters of weight gain for centralized and on farm test for beef bulls." Thesis, University of Limpopo (Turfloop Campus), 2007. http://hdl.handle.net/10386/788.

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Thesis (M.Sc.) (Agriculture) --University of Limpopo, 2007<br>The objectives of this study were to evaluate the effect of pre-weaning selection on estimates of genetic parameters for post-weaning average daily gain in Phases C (ADG-C) and D (ADG-D) and to estimate genetic relationships between average daily gain in the two phases. Performance records of the South African Angus cattle breed was used in the analysis. (Co)variance components and genetic parameters for weaning (WWT), AGD-C and ADG-D were estimated by REML procedures fitting three different models (Models 1, 2 and 3) that differed

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Ernst, Robin Tracy. "Virginia feeder cattle basis by season, location, sex, breed, weight and USDA grade differentials." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44632.

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<p>Explanatory feeder cattle basis models were developed for 16 different Virginia markets by season, futures contract month, weight, lot size, sex, breed and USDA grade differentials. The models are more disaggregated and explain up to 80 percent more of feeder cattle basis variation than any previous research. Since the variables in these explanatory models are all known in advance, these basis models are also predictive. Basis estimates from these models make it possible for a Virginia feeder cattle forward pricing agency to offer forward price and minimum price contracts to small siz

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Pitt, Colin John. "Lowering Sperm Dose Rates in Frozen Semen for Bovine Artificial Breeding." The University of Waikato, 2007. http://hdl.handle.net/10289/2232.

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The New Zealand Dairy industry relies on artificial breeding to produce high genetic merit replacement stock. Proven bull semen is extended and preserved as either ambient temperature product or as frozen doses. High fertility is essential to maintain synchronicity of lactation with the spring surge of grass growth. To improve efficiency in the utilization of the very best bulls producers try to lower sperm dose rates without compromising fertility. Livestock Improvement Corporation's (LIC) Long Last Liquid ™ (LLL) is most commonly used during the peak season and is their most important produc

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