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Дисертації з теми "Cattle Genetics"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 20 лютого 2023

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1

Wang, Wei. "Plasminogen polymorphism in dairy cattle." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26174.

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A genetic approach to lowering protease (plasmin) levels in milk, requires the presence of polymorphism of bovine plasminogen. This study was conducted to determine to what extent genetic polymorphism exists in dairy cattle. Bovine plasminogen was first purified from Holstein cow plasma by affinity chromatography on Lysine-Sepharose and antibodies to bovine plasminogen were raised by monthly intramuscular injection of the isolated bovine plasminogen into rabbits. For plasminogen phenotyping, blood samples were collected at random from 50 Holstein and Ayrshire cattle, and plasminogen was isolat

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2

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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3

Pryce, Jennie Elizabeth. "Genetics of health and fertility in dairy cattle." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/23523.

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In this study genetic parameters were estimated and the importance of genotype by feeding system interactions investigated for a range of health and fertility traits in dairy cattle. Data were from the Langhill Dairy Cattle Research Centre and two UK recording schemes, one a recording scheme operated by the Scottish Livestock Services Ltd. (SLS) and the other a health and fertility recording and management system, the Dairy Information System (DAISY). Genetic parameters for 305 day yield of milk and its components, health traits (mastitis, somatic cell counts (SCC), lameness and milk fever) an

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4

Obike, Onyemauchechi Mercy. "Genetics of health and lameness in dairy cattle." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/4113.

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For the modern dairy cow, advances in genetics and breeding for productivity has resulted in an increasing incidence of health disorders and reduced longevity. One of the most important health problems is lameness, which has led to significant economic, production and welfare consequences. A reduction in lameness will improve the economic future of the dairy industry through increased profitability and decreased welfare-related problems. Although positive attempts have been made by researchers and the industry towards improving lameness, it has remained a persistent ailment for dairy farmers.

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5

Guarini, Aline Rocha [UNESP]. "Genetic relationship between reproductive traits in Nellore cattle." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/92557.

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Made available in DSpace on 2014-06-11T19:26:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-11-21Bitstream added on 2014-06-13T20:33:45Z : No. of bitstreams: 1 000749460.pdf: 1415671 bytes, checksum: 786699c8493a7bd8590e7f9c286f7c1f (MD5)<br>The aim of this study was to estimate genetic parameters between scrotal circumference obtained at 18 months of age (SC) and reproductive traits measured directly in Nellore females, such as number of calvings at 53 months (NC53), heifers rebreeding (HR) and stayability (STAY) in order to investigate the possibility of using traits measured di

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6

Ali, Abdirahman. "Quantitative genetics and genomics of production and disease in beef cattle." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/12296.

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Cattle grazing in extensive open pasture of tropical areas are subjected to several environmental stressors such as heat and humidity, high incidence of disease, cattle ticks and worm infestations. These stressors have major impacts on productivity and animal welfare. The overall focus of this PhD thesis was to conduct classical genetic and modern quantitative genomics analyses for growth and carcass related traits, and disease and parasite tolerance/resistance traits in beef cattle. The specific objectives were: (1) to estimate genetic parameters for growth, carcass related traits, and tropic

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7

Brown, Pamela. "Cloning and characterisation of MHC class 1 genes in cattle." Thesis, University of Edinburgh, 1990. http://hdl.handle.net/1842/30048.

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8

Sirol, Mirella Leme Franco Geraldini [UNESP]. "Análise da heterogeneidade de variância em características de crescimeno de bovinos da raça nelore." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/104056.

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Анотація:

Made available in DSpace on 2014-06-11T19:32:57Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-06-11Bitstream added on 2014-06-13T19:22:50Z : No. of bitstreams: 1 sirol_mlfg_dr_botfmvz.pdf: 1072564 bytes, checksum: 6ed08e0d4f835b1a9e0ed7d60ba42a2d (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Universidade Estadual Paulista (UNESP)<br>Foram utilizados dados de 116406 bovinos da raça Nelore, participantes do Programa de Melhoramento Genético da Raça Nelore (PMGRN), nascidos entre 1995 e 2005, com o objetivo de estimar parâmetros genéticos para os pesos

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9

Brotherstone, Susan H. "Genetics of production, type and herd life in dairy cattle." Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/12813.

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The main objective of this work was to undertake analyses which would lead to an improvement in the accuracy of production and type breeding value predictions for Holstein-Friesian dairy cattle and to investigate the relationship between production and type traits and herd life. Production records were obtained from the National Milk Records files and linear type records from the Holstein Friesian Society. An animal model estimation of heterosis and recombination loss between North American Holstein and European cattle for first lactation milk, fat and protein yield showed that the omission of

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10

Budeli, Mutshinya Ananias. "Genetics evaluation of tick resistance in South African Bonsmara cattle." Thesis, University of Limpopo (Turfloop Campus), 2010. http://hdl.handle.net/10386/883.

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Thesis (M.Sc. (Agric.)) --University of Limpopo, 2010<br>The objectives of the study were to estimate genetic parameters for tick resistance and to evaluate the effect of the level of tick infestation on the estimates of genetic parameters in South African Bonsmara cattle. Field data of repeated tick count records (n = 11 280) on 1 176 animals were collected between 1993 and 2005 by ten breeders participating in the National Beef Recording and Improvement Scheme. The distribution of tick count records were normalized using a Box-Cox transformation. Data were divided into 7 sub-data sets

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11

Kruk, Zbigniew Antoni. "Genetic and non-genetic factors affecting carotenoid concentration in cattle tissues : a thesis for the degree of Doctor of Philosophy at the University of Adelaide in the Department of Animal Science." Title page, table of contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phk94.pdf.

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Includes bibliographical references (leaves 178-194). Genetic and non-genetic factors affecting fat colour in cattle were examined in biopsy and carcass samples of Jersey and Limousin cattle in their F1 and backcross progeny.

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12

Zheng, Jianze. "Use of fluorescence in situ hybridization (FISH) for studying centromere organization and centric fusions in cattle." Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09A/09az63.pdf.

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Includes bibliograpical references (leaves 119-134). The most common chromosome abnormalities in live cattle are various Robertsonian translocations (centric fusions). Two hypotheses have been used to explain how monocentric Robersonian translocation chromosomes are generated: either direct formation, or evolution from dicentic chromosomes. Four main cattle procentric Satellite sequences were used as single and two-colour fluorescence in situ hybridization probes for studying the centromere organisation of cattle autosomes and the rearrangement in two cattle Robertsonian translocation chromoso

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13

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.

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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 dis

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14

Angulo, Rafael Villa. "Computational methods for haplotype inference with application to haplotype block characterization in cattle." Fairfax, VA : George Mason University, 2009. http://hdl.handle.net/1920/4558.

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Thesis (Ph.D.)--George Mason University, 2009.<br>Vita: p. 123. Thesis director: John J. Grefenstette. Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Bioinformatics and Computational Biology. Title from PDF t.p. (viewed Sept. 8, 2009). Includes bibliographical references (p. 114-122). Also issued in print.

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15

Philpot, Jill C. "Relationships between survival and linear type traits in Quebec Holsteins and Ayrshires." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21608.

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The objective of this study was to estimate the relationship between survival at various stages of productive life (17, 30, 43, 55 and 96 months of productive life) and type traits in Quebec Holstein and Ayrshire cows. The original data set from the Programme d'Analyse des Troupeaux Laitiers du Quebec contained 559,203 lifetime records calculated from 2,237,081 lactation records including calvings from 1979 to 1995. Lifetime records containing type classification information provided by the respective breed associations were used to study true survival variables (opportunity to survive to 17,

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16

Ruane, John. "Evaluation of genetic improvement programmes using multiple ovulation and embryo transfer in dairy cattle." Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/11336.

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17

Guarini, Aline Rocha. "Genetic relationship between reproductive traits in Nellore cattle /." Jaboticabal, 2013. http://hdl.handle.net/11449/92557.

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Orientador: Sandra Aidar de Queiroz<br>Banca: Roberto Carvalheiro<br>Banca: Vânia Cardoso<br>Resumo: Não disponível<br>Abstract: The aim of this study was to estimate genetic parameters between scrotal circumference obtained at 18 months of age (SC) and reproductive traits measured directly in Nellore females, such as number of calvings at 53 months (NC53), heifers rebreeding (HR) and stayability (STAY) in order to investigate the possibility of using traits measured directly in females as a selection criteria in cattle breeding programs, besides, studying and evaluating if number of calvings

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18

Rascado, Tatiana da Silva [UNESP]. "Expressão de fatores de transcrição da via de sinalização LIF/JAK/STAT no desenvolvimento embrionário inicial em bovinos." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/105897.

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Made available in DSpace on 2014-06-11T19:35:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-07-19Bitstream added on 2014-06-13T20:26:10Z : No. of bitstreams: 1 rascado_ts_dr_botfmvz.pdf: 519776 bytes, checksum: 01ba22778e4b1e2e1003285f9b0b7014 (MD5)<br>Este experimento objetivou analisar o padrão de expressão do mRNA de SOX2, STAT3 e GBX2 em embriões bovinos produzidos in vitro nos estádios de blastocisto (E7) e blastocisto eclodido (E10). O RNA foi extraído de embriões em cada fase do desenvolvimento embrionário (n=7) e da massa celular interna (MCI) e epiblasto isolados por imun

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19

Rascado, Tatiana da Silva. "Expressão de fatores de transcrição da via de sinalização LIF/JAK/STAT no desenvolvimento embrionário inicial em bovinos /." Botucatu, 2013. http://hdl.handle.net/11449/105897.

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Orientador: Fernanda da Cruz Landim<br>Coorientador: João Pessoa Araujo Junior<br>Banca: Sony Dimas Bicudo<br>Banca: Fabiana Ferreira Sousa<br>Banca: Felipe Perecin<br>Banca: Cláudia Barbosa Fernandes<br>Resumo: Este experimento objetivou analisar o padrão de expressão do mRNA de SOX2, STAT3 e GBX2 em embriões bovinos produzidos in vitro nos estádios de blastocisto (E7) e blastocisto eclodido (E10). O RNA foi extraído de embriões em cada fase do desenvolvimento embrionário (n=7) e da massa celular interna (MCI) e epiblasto isolados por imunocirurgia de 20 embriões (n=20). A expressão do mRNA f

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20

Vargas, Giovana [UNESP]. "Genetic analysis of feet and legs in Nelore cattle." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/123735.

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Made available in DSpace on 2015-06-17T19:33:48Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-02-26. Added 1 bitstream(s) on 2015-06-18T12:48:02Z : No. of bitstreams: 1 000834150.pdf: 983221 bytes, checksum: 48c6e2b8c858629d2760705d7d88d3f8 (MD5)<br>O objetivo deste estudo foi estimar os componentes de variância para a característica aprumo em bovinos da raça Nelore, e realizar estudos de associação genômica ampla para identificar possíveis regiões genômicas relacionadas com sua expressão. Os registros de aprumo foram obtidos pela atribuição de escores visuais em dois momentos difer

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21

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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22

Kakwaya, Damian Saranga Muhongo. "Canadian/New Zealand genotype-environment interaction trial : comparison of growth traits of Canadian and New Zealand dairy cattle in Canada." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29883.

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This study, being part of a larger project - "Canadian/New Zealand GxE Interaction Trial" - is comparing Canadian and New Zealand sired heifers for growth traits within Canada, since differences for growth traits were found in the Polish strain comparison (Jasiorowski et al., 1987) and due to selection programs in the two countries. Twenty Canadian Holstein and twenty New Zealand Friesian progeny tested, A.I. bulls were randomly mated to over 1,000 cows in 10 Canadian herds. 3,539 records of weight and wither height from 475 heifers (i.e. 241 Canadian and 234 New Zealand sired) were generated

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23

Wan, Xiaochun. "Association of cheesemaking characteristics with genetic variants of k-casein and b-lactoglobulin from milk of four breeds of dairy cattle." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20293.

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Laboratory scale Cheddar type cheese were made from 411 milk samples originating from Ayrshire, Brown Swiss, Canadienne and Jersey with different phenotypes of kappa-casein (kappa-CN) and beta-lactoglobulin (beta-LG). From the milk input, cheese and whey outputs, the cheese yield, cheese composition and cheesemaking efficiency and other parameters were determined. The overall 37% moisture adjusted cheese yield and cheese yield efficiency were 11.19g, 10.19g, 11.97g, 11.46g and 98.91%, 90.10%, 90.76% and 90.92% for Ayrshire, Brown Swiss, Canadienne and Jersey respectively. The milk of the four

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24

Huynh, The Hung. "The role of DNA methylation in the regulation of bovine B-casein and a-lactalbumin gene expression." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28784.

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DNA methylation has been shown to be involved in switching a number of genes on or off in particular cells. The relationship between DNA methylation and $ beta$-casein gene expression in the mammary tissue of lactating cows and mammary epithelial cells was examined. A positive correlation existed between hypomethylation of two MspI/HpaII sites in the body and one MspI/HpaII site in the 3$ sp prime$ end of the $ beta$-casein gene and its expression. In addition to these sites, hypomethylation of a distal MspI/HpaII site and HindIII sensitivity at a HindIII site also correlated with gene express

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25

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.

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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 Leg

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26

Svensson, Emma M. "Detecting Sex and Selection in Ancient Cattle Remains Using Single Nucleotide Polymorphisms." Doctoral thesis, Uppsala universitet, Evolutionsbiologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-123261.

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All contemporary taurine cattle originated some 10,000 years ago when their wild ancestor, the aurochs, was domesticated in the Near East. Although the aurochs was widespread also in Europe, there is no evidence for a local domestication. The aurochs has been extinct since 1627 and therefore little is known about its biology. Following domestication, cattle were selected for traits of interest to humans. All modern cattle breeds were developed in the 19th century and the only sources of information about prehistoric breeding practices, and breeds, come from a few ancient Roman Empire and medie

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27

Vargas, Giovana. "Genetic analysis of feet and legs in Nelore cattle /." Jaboticabal, 2015. http://hdl.handle.net/11449/123735.

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Orientador: Roberto Carvalheiro<br>Coorientador: Danísio Prado Munari<br>Coorientador: Haroldo Henrique de Rezende Neves<br>Banca: Fernando Sebastián Baldi Rey<br>Banca: Idalmo Garcia Pereira<br>Resumo: O objetivo deste estudo foi estimar os componentes de variância para a característica aprumo em bovinos da raça Nelore, e realizar estudos de associação genômica ampla para identificar possíveis regiões genômicas relacionadas com sua expressão. Os registros de aprumo foram obtidos pela atribuição de escores visuais em dois momentos diferentes: FL1) característica binária medida ao sobreano, com

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28

Giess, Lane Kurtis. "Development of a feet and leg scoring method and selection tool for improved soundness in Red Angus cattle." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/38258.

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Master of Science<br>Department of Animal Sciences and Industry<br>Robert L. Weaber<br>Feet and leg soundness is an important trait for beef producers as it has an impact on cow longevity and animal well-being. The objective of this study was to investigate genetic parameter estimates for feet and leg traits, understand the relationship between feet and leg traits and Stayability EPD, and develop a scoring method for feet and leg traits in Red Angus cattle. Cattle were scored on 14 subjective traits: Body Condition Score (BCS), Front Hoof Angle (FA), Front Heel Depth (FHD), Front Hoof Claw Sha

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29

Kgwatalala, Patrick M. 1973. "Genetic polymorphisms in the stearoyl-CoA desaturase1 (SCD1) gene and their influence on the conjugated linoleic acid (CLA) and monounsaturated fatty acids (MUFA) content of milk fat of Canadian Holstein and Jersey cows." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115690.

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Stearoyl-CoA desaturase1 (SCD1) catalyzes the synthesis of conjugated linoleic acid (CLA) and mono-unsaturated fatty acids (MUFA) in the mammary gland of ruminant animals. We hypothesized that single nucleotide polymorphisms (SNPs) in the coding region, 5' and 3' untranslted regions (UTRs) of the SCD1 gene would influence the activity of SCD1 enzyme and consequently account for some within-breed variations in milk CLA and MUFA. Sequence analysis of the coding region of the SCD1 gene of Jerseys and Holsteins revealed c.702A→G, c.762T→C and c.878C→T SNPs in exon 5 in both breeds a

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30

Steinbock, Lena. "Comparative aspects on genetics of stillbirth and calving difficulty in Swedish dairy cattle breeds /." Uppsala : Dept. of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/10135579.pdf.

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31

Wang, Xiaoliang 1980. "DNA methylation of two milk protein genes in lactating and non-lactating bovine mammary gland tissues." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116076.

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It is well known that DNA methylation in gene promoter regions inhibits gene transcription and that tissue-specific gene expression is partially under the control of this transcription regulatory mechanism. In this study, bovine mammary gland tissues were collected from individual animals in lactating and non-lactating stages to investigate the DNA methylation patterns in the kappa-casein gene and alpha-lactalbumin gene core promoter regions using the bisulphite treatment in combination with polymerase chain reaction (PCR) sequencing. Different methylation status of each sample was classified

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32

Osterstock, Jason Barrett. "Genetic epidemiology and familial risk factors for paratuberculosis seropositivity in beef cattle." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2435.

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33

Blair, Erika Elaine. "Relationship between feed efficiency and reproductive measurements in beef cattle." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/12009.

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Master of Science<br>Department of Animal Sciences and Industry<br>Jennifer M. Bormann<br>It is important for animals to be feed efficient and reproductively sound to optimize profits for cow- calf producers. The objective of this study was to determine the relationship between feed efficiency and reproductive performance. Feed efficiency measures included residual feed intake (RFI), feed to gain ratio (F:G) and daily dry matter intake (DMI). Reproductive measurements were pregnancy rate, first service conception rate, pregnancy type (AI, natural. open), calving percentage, calving day (CD) an

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34

Schaeffer, George Barry. "Genetic evaluation of a linear trait description." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/101262.

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Data for this study were 79,997 evaluations for 12 individual body and udder traits of Holstein cows. Type scores were subjectively assigned by trained personnel of Select Sires, Inc., Plain City, OH, through their corrective mating and young sire evaluation programs. After editing data to remove incomplete, erroneous and duplicate records, 56,642 records were used to calculate overall and regional age adjustment factors. Genetic parameters were estimated. Heritabilities ranged from .40 for stature to .14 for fore udder. Standard errors ranged from .039 for stature to .018 for fore udder. Ge

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35

Van, der Westhuizen Robert Rolfe. "Variance and covariance component estimation of reproductive traits in a multibreed beef cattle herd applying linear and threshold models." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52604.

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Thesis (MScAgric )--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: The main object of this study was to estimate heritabilities and possible genetic correlations for and between reproductive traits in a composite multi breed beef cattle herd. Reproduction is a complex process with many components. Due to the nature of the data, obtained from the two farms of the Johannesburg Metropolitan Council from 1974 to 1993, only calving date (CD), calving date with a penalty score (CDP), calving success (CS), calving interval (CI), age at first calving (AFC), longevity and stayability at 3

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36

Wankowski, Jacek Wieslaw Jerzy. "A Reimagined Past: Are Mobility, Pastoralism, and Cattle the Socioeconomic and Technology Drivers of the Middle Holocene Transformation?" Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29535.

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The Middle Holocene (8,000-2,000 BC) was a period of immense socioeconomic and technological transformation. This thesis examines the development and impact of the combination of cattle, mobility, and pastoralism, together comprising a Mobile Pastoralism Package. Since data on mobile pastoralism are exceptionally fragmented and ‘disorderly’, independent lines of evidence: comparands, zooarchaeological, archaeological, human and cattle genetic data are used to test a set of hypotheses. Published data are used to investigate the origin of cattle and the MPP, and the MPP’s development and adoptio

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37

Anderung, Cecilia. "Genetic Analyses of Bovid Remains and the Origin of Early European Cattle." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7201.

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38

Richard, Marilyn. "Fine-mapping of a quantitative trait locus on chromosome 20 in Holstein cattle." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80863.

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The growth hormone receptor gene (GHR) has been previously documented to be a good candidate gene for detection of a quantitative trait locus (QTL) which influences milk production in Holstein cattle. In this study, the promoter region of the GHR gene and microsatellite markers AGAL29 and BM5004 were studied. Their effects on milk yield (MY), fat yield (FY), protein yield (PY), fat percentage (FP) and protein percentage (PP) were examined. DNA was isolated from 1746 used by the artificial insemination (AI) industry representing 26 half-sibling families. Three polymorphisms in the GHR ge

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39

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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40

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.

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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 restri

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41

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.

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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 Functi

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42

Raphaka, Kethusegile. "Estimation of genetic and non-genetic parameters for growth traits in two beef cattle breeds in Botswana." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/20857.

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Thesis (MScAgric)--Stellenbosch University, 2008.<br>ENGLISH ABSTRACT: Research conducted on beef cattle in Botswana investigated both growth and reproduction. These studies however, did not specifically determine the influence of the different environmental factors on growth in the Tswana and Composite beef cattle breeds. The establishment of a national beef herd recording and performance testing scheme requires knowledge on the appropriate adjustment methods of field data for the fixed effects such as sex of calf and age of dam. A fair comparison of birth and weaning weights between male and

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43

Nadarajah, Kanagasabai. "Evaluation of phenotypic and genetic trends in weaning weight in Angus and Hereford populations in Virginia." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/74717.

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Total weaning weight records of 29,832 Angus and 15,765 Hereford calves born during 1953 through 1983 in Virginia were used to evaluate phenotypic and genetic trends for adjusted weaning weight (AWWT), weaning weight ratio (WWR) and deviation of AWWT from the mean AWWT of the contemporaries (DEVN). Two approaches, namely the regression techniques and maximum likelihood (ML) procedure were taken to estimate the above trends. The estimates of annual phenotypic trend for AWWT in the Angus and Hereford breeds were .96 and .82 kg/yr, respectively. The sire and dam genetic trends obtained from bot

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44

Khombe, Carroll Themba. "The inheritance of weaning weight in Mashona cattle grazing on free range in Zimbabwe." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41636.

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Genetic parameters were estimated using 8086 weaning weight records of Mashona cattle from commercial herds in Zimbabwe, through Derivative-free Restricted Maximum Likelihood (DFREML) procedure fitting an individual animal model. All known additive relationships among animals were incorporated and all sires were assumed to have been bred by unknown parents. A simulation study was carried out to estimate the amount of bias in the estimated genetic parameters caused by the failure to account for the true relationships among the breeding animals.<br>Genetic differences between the weaning weights

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45

Englishby, Tanya Marie. "Genetic and non-genetic evaluation tools for accelerating improvement in beef cattle carcass traits within and across country." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31091.

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The main revenue source for beef cattle farmers is the price they are awarded for carcasses based on carcass value (i.e., carcass weight, conformation and fat score) which is influenced by genetic and environmental factors (e.g., herd management). In order to improve profitability, accurate means of evaluating and improving both sets of factors influencing carcass trait performance are necessary. This would entail optimal management of genetic resources and herd practices. Furthermore, access to a large international germplasm pool would facilitate faster genetic gain. The objective of this th

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46

Sirol, Mirella Leme Franco Geraldini. "Análise da heterogeneidade de variância em características de crescimeno de bovinos da raça nelore /." Botucatu : [s.n.], 2007. http://hdl.handle.net/11449/104056.

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Orientador: Henrique Nunes de Oliveira<br>Banca: Raysildo Barbosa Lobo<br>Banca: Maria Eugenia Zerlotti Mercadante<br>Banca: Marcílio Dias Silveira da Mota<br>Banca: Luiz Artur Loyola Chardulo<br>Resumo: Foram utilizados dados de 116406 bovinos da raça Nelore, participantes do Programa de Melhoramento Genético da Raça Nelore (PMGRN), nascidos entre 1995 e 2005, com o objetivo de estimar parâmetros genéticos para os pesos padronizados aos 120(P120), 210(P210), 365(P365), 450(P450) e 730(P730) dias de idade e para os ganhos em peso do nascimento aos 120(GP120), dos 120 aos 210 (GP210), dos 210 a

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47

Kepenek, Eda Seyma. "Polymorphism Of Prolactin (prl), Diacylglycerol Acyltransferase (dgat-1) And Bovine Solute Carrier Family 35 Member 3 (slc35a3) Genes In Native Cattle Breeds And Its Implication For Turkish Cattle Breeding." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609121/index.pdf.

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In the present study samples from four native Turkish Cattle Breeds<br>South Anatolian Red (n= 48), East Anatolian Red (n= 34), Anatolian Black (n= 42) and Turkish Grey (n=46) and elite bulls of Holstein (n=21) were genotyped with respect to two milk production enhancer genes, Prolactin (PRL) and Diacylglycerol acyltransferase (DGAT1), and one disease (Complex Vertebral Malformation) causing gene (SLC35A3). A allele frequency for PRL gene, believed to be positively associated with the milk yield in cattle, ranged between 0.5645 (Anatolian Black) - 0.7558 (South Anatolian Red). K allele frequen

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48

Smith, Algina Maria Johanna. "Genetic analyses of growth traits for the Simbra composite breed." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4168.

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Thesis (MScAgric (Animal Sciences))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: The aim of this study was to evaluate the Simbra breed of cattle for certain non-genetic as well as genetic parameters influencing live weight traits in the breed. Live weight traits included birth weight (BW), weaning weight at 200 days of age (WW), yearling weight at 400 days of age (YW) and 600 day weight. The Simmental and Simbra Breeders’ Society of Southern Africa availed 148751 records for analysis from the year 1987 till 2009. Due to deficiencies of various kinds in the data and the restric

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49

Melka, Hailu Dadi. "Genetic parameter estimates for weaning traits in a multibreed beef cattle population." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52285.

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Thesis (MScAgric)--University Stellenbosch, 2001.<br>ENGLISH ABSTRACT: The aim of this study was to estimate genetic parameters as well as to evaluate the influence of some genetic factors on preweaning growth traits in a multi breed beef cattle population. These preweaning growth traits were birth weight (BW), weaning weight (WW) and average daily gain (ADG). Three aspects were addressed in this particular study; namely the Estimation of (co)variance components and genetic parameters, the effect of sire breeds and dam genotypes and the contribution of Charolais and Angus breeding levels

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50

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.

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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 herd

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