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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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