Artículos de revistas
Genetic parameters for milk, fat and protein yields in Murrah buffaloes (Bubalus bubalis Artiodactyla, Bovidae)
Fecha
2010-01-01Registro en:
Genetics and Molecular Biology. Ribeirao Pret: Soc Brasil Genetica, v. 33, n. 1, p. 71-77, 2010.
1415-4757
S1415-47572010000100014
WOS:000275106000014
S1415-47572010000100014-en.pdf
7445254960858159
5866981114947883
Autor
Universidade Estadual Paulista (Unesp)
Universidad Nacional Agraria de la Selva (UNAS)
Agência Paulista de Tecnologia dos Agronegócios (APTA)
Institución
Resumen
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.