Holstein Breed
Mostrando 13-24 de 28 artigos, teses e dissertações.
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13. 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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14. 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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15. Modelos de regressão aleatória na estimação de parâmetros genéticos para produção e persistência nas características produtivas de vacas da raça holandesa / Random regression models in the genetic parameters estimation for production and persistency in the productive traits from the cows of the holstein breed
Com o objetivo de estimar parâmetros genéticos para as produções no dia do controle e para seis medidas para a persistência nas produções de leite, de gordura e de proteína, de vacas da raça Holandesa, do Estado de Minas Gerais, foram usados 56.508, 35.091 e 8.326 registros, de 7.015, 4.476 e 1.114 vacas, filhas de 6.089, 3.875 e 984 mães e 359, 24
Publicado em: 2009
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16. Evaluation of milk production systems using a dynamic simulation model / Avaliação de sistemas de produção de leite por meio de modelo dinâmico de simulação
The Thesis is divided into four chapters. Chapter 1 aimed at selecting functions that mathematically represent lactation curves, providing a better fit to the observed data, to be used in simulation models of milk production systems. Data base was built with 6,459 recordings of daily milk production per cow obtained from monthly and quarterly milk controls b
Publicado em: 2008
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17. Variability of milk protein fraction in dairy herds of state of São Paulo / Variabilidade de frações protéicas do leite em rebanhos leiteiros do estado de São Paulo
The objective of this experiment was to study the variability of the true protein of milk produced in dairy herds of Sao Paulo State, under the influence of milk somatic cell count, breeds, season of the year and production system. For this aim, fifty commercial herds were selected; these herds were divided by breeds in: 17 Holstein, six Jersey, and 26 Girol
Publicado em: 2008
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18. Polymorphisms in MUC1 and osteopontin genes in Nelore heifers / Polimorfismos dos genes MUC1 e Osteopontina em novilhas da raça Nelore (Bos taurus indicus)
MUC1 (MUC1) and osteopontin (SPP1) are glycoproteins expressed in the uterine luminal surface with predict functions in protection and cell adhesion. MUC1 has anti-adhesive role and osteopontin has adhesive role. The expression of both molecules is regulated by the steroid hormone, progesterone. During the receptive period for embryo implantation in the uter
Publicado em: 2007
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19. Endogamia na Raça Holandesa no Brasil / Inbreeding on Holstein breed in Brazil
A realização deste trabalho teve como objetivo avaliar as tendências da endogamia na raça Holandesa e estudar os seus efeitos sobre a produção de leite. O arquivo de pedigree utilizado nas análises era composto por 248.141 animais da raça Holandesa nascidos entre 1960 e 2002. 98.524 observações de primeira lactação. O arquivo de lactações foi e
Publicado em: 2006
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20. The involution of the mammary gland in Holstein cows: clinical evaluation of the udder and physicochemical, cellular and microbiological characteristics of the lacteal secretion in the dry period / Processo de secagem da glândula mamária de bovinos da raça holandesa: avaliação física da involução da mama e das características físico-químicas, celulares e microbiológicas da secreção láctea durante o período seco
Com o objetivo de avaliar o processo de secagem da glândula mamária de vacas da raça Holandesa foram examinadas 44 mamas na fase final da lactação, durante a evolução do processo de secagem (dia da última ordenha; 1º, 3º, 5º, 7º, 10º, 15º, 30º e 45º dia do período seco), assim como no retorno à lactação. Antes da colheita das amostras, a
Publicado em: 2006
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21. DNA polymorphism of leptin gene in Bos indicus and Bos taurus cattle
Leptin plays an important role in the regulation of feed intake, energy metabolism, growth and reproduction of cattle. We used the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) technique to screen for DNA polymorphisms of the leptin gene in 403 cattle belonging to various breeds of Bos indicus (Hariana, Sahiwal, Gir and Nimari
Genetics and Molecular Biology. Publicado em: 2005-12
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22. QTL mapping for tick resistence, birth weight and weight after sixty days on chromossome 23 from F2 design breeding of bovines Holstein x Gir. / Mapeamento de QTL para características de resistência a carrapato, peso ao nascimento e peso a desmama no cromossomo 23 de bovinos da geração F2, cruzamento Holandês x GIR.
A F2 design population had been developed from the breeding between four male holstein with twenty eight female Gir, generating a F1 with one hundred and fifty animals, from these sample four male have been chosen based on their fertility for matching. They have been breed with sixty eight females, producing the F2 generation with about four hundred individu
Publicado em: 2005
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23. AGROECOLOGICAL MANAGEMENT OF ELEPHANTGRASS UNDER GRAZING, MIXED WITH CULTURES OF SUMMER AND WINTER CYCLES / MANEJO AGROECOLÓGICO DO CAPIM-ELEFANTE SOB PASTEJO, CONSORCIADO COM CULTURAS DE CICLO ESTIVAL E HIBERNAL
The work was conducted in Santa Maria, RS, Brazil, with the objective of to evaluate an elephantgrass pasture (Pennisetum purpureum Schum.) var. Merckeron Pinda, under rotational grazing, during the agricultural year of 2002. The elephantgrass was established in lines separated by three meters, at October of 2001 on a 0,33 ha area. Organic fertilization was
Publicado em: 2004
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24. Comparative study of different systems of buildings for milk production with emphasis on the indexes of thermal comfort and on the economical characterization. / Estudo comparativo de diferentes sistemas de instalações para produção de leite tipo B, com ênfase nos índices de conforto térmico e na caracterização econômica.
The objective of the present work was to undertake a study of case comparing indexes of thermal comfort inside different installations for milking cows of Holstein Breed at two private properties in the region of Vale do Paraíba, São Paulo State, Brazil. The properties were close to each other and presented similar characteristics for topography and enviro
Publicado em: 2001