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Genetic association between longevity and linear type traits of Holstein cows. Repositório Alice
KERN, E. L.; COBUCI, J. A.; COSTA, C. N.; MCMANUS, C. M.; BRACCINI NETO, J..
Longevity is a desirable trait in the dairy industry because of its relationship to profitability. The aim of this study was to estimate genetic parameters for longevity measurements related to productive life, or life in the herd, and linear type traits of Brazilian Holstein cows born between the years 1990 and 2008. The (co) variance components were estimated by the restricted maximum likelihood method. The heritability for measurements of longevity and linear type traits ranged from 0.05 to 0.07 and 0.08 to 0.39, respectively. The genetic correlations between measurements of longevity and linear type traits ranged from -0.39 to 0.31. Direct selection for longevity does not necessarily lead to long-lived cows, due to low heritability. Indirect genetic...
Tipo: Separatas Palavras-chave: Mammary system; Productive life; Rear teat placement.; Genetic correlation..
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1033243
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Genetic association between longevity and linear type traits of Holstein cows Scientia Agricola
Kern,Elisandra Lurdes; Cobuci,Jaime Araujo; Costa,Cláudio Napolis; McManus,Concepta Margaret; Braccini Neto,José.
Longevity is a desirable trait in the dairy industry because of its relationship to profitability. The aim of this study was to estimate genetic parameters for longevity measurements related to productive life, or life in the herd, and linear type traits of Brazilian Holstein cows born between the years 1990 and 2008. The (co) variance components were estimated by the restricted maximum likelihood method. The heritability for measurements of longevity and linear type traits ranged from 0.05 to 0.07 and 0.08 to 0.39, respectively. The genetic correlations between measurements of longevity and linear type traits ranged from -0.39 to 0.31. Direct selection for longevity does not necessarily lead to long-lived cows, due to low heritability. Indirect genetic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic correlation; Mammary system; Productive life; Rear teat placement.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300203
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Genetic evolution of milk yield, udder morphology and behavior in Gir dairy cattle R. Bras. Zootec.
Fernandes,André Rabelo; Faro,Lenira El; Vercesi Filho,Anibal Eugênio; Machado,Carlos Henrique Cavallari; Barbero,Leandro Martins; Bittar,Eustáquio Resende; Igarasi,Mauricio Scoton.
ABSTRACT The objective of this study was to analyze the genetic evolution of milk production, udder morphology, and animal behavior of Gir dairy cattle. Data were obtained on the predicted breeding values for milk yield of 60,226 cows born from 1968 to 2015 and standardized predicted breeding values for udder conformation and milking behavior of 7,635 cows born from 1987 to 2015. The influence of tested bulls on genetic trends was discussed, with special focus on the period after 1993, the year when the predicted breeding values of the first group of tested bulls were released. The traits of interest were 305-d milk yield, fore udder attachment, rear udder height, rear udder width, teat length, teat thickness, ease of milking, and reactivity. Significant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Linear traits; Mammary system; Reactivity; Teat morphology; Udder attachment.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100304
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