Data/hora: 16/06/2024 04:41:34

Provedor de dados: | 2
País: | Brazil
Título: | Estimation of genetic and phenotypic trends for dairy traits of Gyr and Guzerá breeds
Autores: | Rangel, Adriano Henrique do Nascimento; Araújo, Thalita Polyana Monteiro; Lima, Guilherme Ferreira da Costa; Borba, Luiz Henrique Fernandes; Peixoto, Maria Gabriela Campolina Diniz; Lima Júnior, Dorgival Morais de.
Data: | 2017-12-27
Ano: | 2017
Palavras-chave: | Genetic progress; Milk production; Selection; Zebu.
Resumo: | Milk production has high economic importance in dairy cattle production systems, which justifies its inclusion in genetic breeding programs. The objective of this study was to evaluate the genetic and phenotypic trends of dairy traits in Gyr (167 lactations) and Guzerá (148 lactations) breeds in the State of Rio Grande do Norte (RN). Milk, fat and protein production obtained from monthly dairy controls were the traits evaluated. The expected differences in progeny (DEPs) for these traits were estimated using an animal model. From the means of phenotypic values and DEPs, we estimated the genetic and phenotypic trends in linear regressions as a function of the year of calving of the animal. Positive genetic and phenotypic trends were observed for Gyr (26.8 and 88.7 kg year-1) and Guzerá (8.44 and 37.68 kg year-1). Gyr breed presented positive genetic trends for fat (1.08 kg year-1) and protein (0.45 kg year-1) production and the Guzerá breed showed positive genetic trends for fat (0.36 kg year-1) and protein (0.25 kg year-1) production. The selection applied in the evaluated herds has produced satisfactory genetic and phenotypic progress for milk, fat and protein production.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês

Identificador:

http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/36685

10.4025/actascianimsci.v40i0.36685

Editor: | Editora da Universidade Estadual de Maringá
Relação: | http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/36685/pdf
Formato: | application/pdf

Fonte:

Acta Scientiarum. Animal Sciences; v. 40 (2018): Publicação Contínua; e36685

Acta Scientiarum. Animal Sciences; v. 40 (2018): Publicação Contínua; e36685

1807-8672

1806-2636

Fonte: | Direitos autorais 2017 Acta Scientiarum. Animal Sciences