Data/hora: 11/06/2024 04:42:35

Provedor de dados: | 2
País: | Brazil
Título: | Appropriate mathematical models to describe the lactation curves of milk production traits of Iranian Holstein dairy cattle
Autores: | Naderi, Yousef.
Data: | 2018-04-01
Ano: | 2018
Palavras-chave: | Dairy cow; Model fitting; Lactation curves; Genetic trend; Milk production.
Resumo: | The objective of this study was to compare the goodness of fit of lactation curve models; Wood, Wilmink, Linear Splines (SPL), Cubic Splines (SPC), Quadratic Splines (SPQ), Cobby and Le Du, Ali Schaeffer and Legendre Polynomial (LEG), in random regression model (RRM) for milk production traits of Iranian Holstein dairy cattle. For this purpose the records obtained from Test-day (TD) regarding milk (928513), fat (788577) and protein (653317) yields related to their first parity were used. These data collected from the years of 2003 to 2011 by the Karaj breeding center of Iran. The genetic parameters were estimated using REML method using WOMBAT software. Based on obtained results, RRM with SPL6 (6,6), SPC6 (6,6) and LEG (3,5) for milk yield, SPL6 (6,6), SPQ6 (6,6), LEG (3,5) for fat yield and SPL5 (5,5), SPQ4 (4,4) and LEG (3,4) for protein yield, were selected as better model to describe the lactation curves. The estimated heritabilities by best models were lower in the beginning lactation than other during lactation. The genetic trend of milk yields was showed an increasing during the 10 past years, which indicated Iranian Holstein dairy cattle population genetically was improved for milk yields.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês

Identificador:

http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/37895

10.4025/actascianimsci.v40i1.37895

Editor: | Editora da Universidade Estadual de Maringá
Relação: | http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/37895/pdf
Formato: | application/pdf

Fonte:

Acta Scientiarum. Animal Sciences; v. 40 (2018): Publicação Contínua; e37895

Acta Scientiarum. Animal Sciences; v. 40 (2018): Publicação Contínua; e37895

1807-8672

1806-2636

Fonte:

Direitos autorais 2018 Acta Scientiarum. Animal Sciences

http://creativecommons.org/licenses/by/4.0