Gyr Cattle
Mostrando 13-24 de 25 artigos, teses e dissertações.
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13. Mapping of QTL for milk production traits on bovine chromosome in Gyr dairy cattle / Mapeamento de QTL para características de produção de leite no cromossomo 6 em rebanhos Gir Leiteiro
In tropical countries, Gyr (Bos indicus) breed is very important due to their heat and parasite tolerance, and essential to girolando cattle formation (5/8 Holstein, 3/8 Gyr). Dairy Gyr is much more adapted to climate and economical traits in Brazil and with crucial qualities for a good milk production on the tropics. The dairy Gyr was the first Zebu breed i
Publicado em: 2009
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14. Expressão gênica em bibliotecas de cDNA de pele de bovinos F2 (Holandês × Gir) infestados com o carrapato Riphicephalus (Boophilus) microplus / Gene expression in skin cDNA libraries from F2 cattle (Holstein × Gyr) infested with the tick Riphicephalus (Boophilus) microplus
It is known that resistance to cattle tick Riphicephalus (Boophilus) microplus is inheritable and are primarily associated with zebu animals (Bos indicus), although also present at lower levels in some breed taurine (B. taurus). The elucidation of genetic resistance is one of the most promising factors to reduce production losses and to reduce the cost of th
Publicado em: 2009
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15. Medidas de persistência da produção de leite em rebanhos Gir Leiteiro utilizando modelos de regressão aleatória / Persistency of milk yield measures in Gyr herds using random regression models
Data comprising 27,000 test-day milk yield (TDMY) records of 3,362 first lactations of Gyr cows calving between 1990 and 2007 were used to compare random regression models for biweekly TDMY and to evaluate persistency of lactation milk yield (PS) measures. Records were analyzed by random regression models (RRM). Random trajectories were fitted by Wilminks (W
Publicado em: 2009
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16. Alternativas para avaliação genética na raça gir leiteiro / Alternatives for genetic evaluation in gyr cattle
Os arquivos de pedigree e de produção de leite da raça Gir provenientes do Programa Nacional de Melhoramento do Gir Leiteiro (PNMGL), conduzido pela Embrapa Gado de Leite em parceria com a Associação Brasileira dos Criadores de Gir Leiteiro (ABCGIL), foram utilizados na pesquisa de alternativas para avaliação genética da produção de leite na raça
Publicado em: 2009
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17. Desempenho produtivo de vacas da raça Gir linhagem leiteira alimentadas com níveis crescentes de concentrados e proteínas em confinamento ou pastejo / Productive perfomance of Gyr cows selected for milk food concentrate levels and protein in feedlot or pasture
Dois experimentos foram conduzidos com vacas da raça Gir Leiteiro em lactação com o objetivo de avaliar os efeitos dos níveis crescentes de concentrados e de nutrientes sobre o consumo de matéria seca e de nutrientes, digestibilidades, estimativas da excreção fecal por indicadores internos e saquinhos de Ankon e TNT, produção e composição do leite
Publicado em: 2008
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18. QTL identification in bovine chromosomes 10, 11 and 12 associated with heat stress / Identificação de QTL nos cromossomos 10, 11 e 12 associados ao estresse calórico em bovinos
Heat stress impacts greatly animal production systems on tropical regions causing economical losses and affects milk production, meat production, physiology, reproduction, calf mortality and utter health. One way to reduce these losses is to use the genetic variation between Bos taurus and Bos indicus breeds for heat tolerance coupled with linked molecular m
Publicado em: 2007
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19. Association of the bovine major histocompatibility complex (BoLA) BoLA-DRB3 gene with fat and protein production and somatic cell score in Brazilian Gyr dairy cattle (Bos indicus)
The effect of the bovine major histocompatibility complex (BoLA) locus on animal health may be due to a direct action of its alleles on immune functions, whereas its indirect effect on production traits might be explained by the better general health conditions of more productive animals. In the present study, the BoLA-DRB3 gene was investigated in 1058 cows
Genetics and Molecular Biology. Publicado em: 2006
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20. Endogamia na raça Gir / Inbreeding on Gyr cattle
Os arquivos de pedigree e produção da raça Gir selecionada para produção de leite, armazenados na Embrapa Gado de Leite, foram utilizados para análise da estrutura genética da população, estudo do efeito da endogamia sobre características produtivas e reprodutivas, e avaliação genética comparativa entre base genética completa e selecionada. O p
Publicado em: 2006
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21. Genome scan for QTL related to bovine resistance to Boophilus microplus / Varredura genômica para QTL associados à resistência a Boophilus microplus em bovinos
In tropical countries losses caused by bovine tick infestation have a tremendous economic impact on production systems. Genetic variation between Bos taurus and Bos indicus to tick resistance and molecular biology tools might facilitate the use of molecular markers linked to resistance traits as an auxiliary tool in selection programs. The objective of this
Publicado em: 2006
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22. Mapeamento de QTLs para caracterísitcas de crescimento e de resistência no cromossomo 14 de bovinos F2 provenientes de um cruzamento Gir x Holandês.
Brazil possesses the largest commercial bovine herd in the world and cattle represents about 43% of agricultural PIB of Brazil. Crossing Bos taurus and Bos indicus species allows the combination of traits of production from the first specie and of rusticity from the second specie for the genetic improvement of the bovines. Due to the economical relevance of
Publicado em: 2006
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23. Quantitative trait locus affecting birth weight on bovine chromosome 5 in a F2 Gyr x Holstein population
Segregation between a genetic marker and a locus influencing a quantitative trait in a well delineated population is the basis for success in mapping quantitative trait loci (QTL). To detect bovine chromosome 5 (BTA5) birth weight QTL we genotyped 294 F2 Gyr (Bos indicus) x Holstein (Bos taurus) crossbreed cattle for five microsatellite markers. A linkage ma
Genetics and Molecular Biology. Publicado em: 2005-12
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24. Genetic characterization of Aberdeen Angus cattle using molecular markers
Aberdeen Angus beef cattle from the Brazilian herd were studied genetically using restriction fragment length polymorphism (RFLP) of the kappa-casein - HinfI (CSN3 - HinfI), beta-lactoglobulin - HaeIII (LGB - HaeIII) and growth hormone AluI (GH- AluI) genes, as well as four microsatellites (TEXAN15, CSFM50, BM1224 and BM7160). The RFLP genotypes were determi
Genetics and Molecular Biology. Publicado em: 2003