Data/hora: 08/06/2024 12:02:09

Provedor de dados: | 74
País: | Brazil
Título: | Genetic parameters for milk, fat and protein yields in Murrah buffaloes (Bubalus bubalis Artiodactyla, Bovidae)
Autores: | Aspilcueta-Borquis,Rusbel Raúl; Sesana,Roberta Cristina; Berrocal,Milthon Honorio Munoz; Seno,Leonardo de Oliveira; Bignardi,Annaiza Braga; El Faro,Lenira; Albuquerque,Lucia Galvão de; Camargo,Gregório Miguel Ferreira de; Tonhati,Humberto.
Data: | 2010-01-01
Ano: | 2010
Palavras-chave: | Test-day model; Accumulated productions; Heritability; Genetic correlations.
Resumo: | The objective of the present study was to estimate genetic parameters for test-day milk, fat and protein yields and 305-day-yields in Murrah buffaloes. 4,757 complete lactations of Murrah buffaloes were analyzed. Co-variance components were estimated by the restricted maximum likelihood method. The models included additive direct genetic and permanent environmental effects as random effects, and the fixed effects of contemporary group, milking number and age of the cow at calving as linear and quadratic covariables. Contemporary groups were defined by herd-year-month of test for test-day yields and by herd-year-season of calving for 305-day yields. The heritability estimates obtained by two-trait analysis ranged from 0.15 to 0.24 for milk, 0.16 to 0.23 for protein and 0.13 to 0.22 for fat, yields. Genetic and phenotypic correlations were all positive. The observed population additive genetic variation indicated that selection might be an effective tool in changing population means in milk, fat and protein yields.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000100014
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572010005000005
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.33 n.1 2010
Fonte: | info:eu-repo/semantics/openAccess