Data/hora: 03/06/2024 18:00:08

Provedor de dados: | 96
País: | Brazil
Título: | Inbreeding on productive and reproductive traits of dairy Gyr cattle
Autores: | Reis Filho,João Cruz; Verneque,Rui da Silva; Torres,Robledo de Almeida; Lopes,Paulo Sávio; Raidan,Fernanda Santos Silva; Toral,Fabio Luiz Buranelo.
Data: | 2015-05-01
Ano: | 2015
Palavras-chave: | Dairy cattle; Genetic parameter; Heritability; Inbreeding depression.
Resumo: | The objective of this study was to estimate genetic parameters and to evaluate the effects of inbreeding on productive and reproductive traits of dairy Gyr cattle. Single-trait animal models were used to estimate genetic parameters and solutions for inbreeding coefficients for milk (milk 305-d), fat (fat 305-d), protein (protein 305-d), lactose (lactose 305-d), and total solids (TS 305-d) yield up to 305 days of lactation, days in milk (DIM), age at first calving (AFC) and calving intervals (CI). The mean inbreeding coefficient was 2.82%. The models with linear and quadratic effects of inbreeding coefficients fitted the data better than the models without or with only linear effect of inbreeding coefficient for all traits. The increase in inbreeding coefficient caused several losses in productive and reproductive traits of dairy Gyr cattle. Estimates of heritability for milk 305-d, fat 305-d, protein 305-d, lactose 305-d, TS 305-d, DIM, AFC, and CI were 0.28, 0.27, 0.22, 0.21, 0.22, 0.17, 0.20, and 0.10, respectively. It is possible to achieve genetic progress in productive traits (especially in milk 305-d and fat 305-d) and age at first calving in dairy Gyr cattle through selection.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000500174
Editor: | Sociedade Brasileira de Zootecnia
Relação: | 10.1590/S1806-92902015000500002
Formato: | text/html
Fonte: | Revista Brasileira de Zootecnia  v.44 n.5 2015
Fonte: | info:eu-repo/semantics/openAccess