Genetic parameters for milk, fat and protein yields in Murrah buffaloes (Bubalus bubalis Artiodactyla, Bovidae)

Genetics and Molecular Biology

Rusbel Raúl Aspilcueta-borquis²  Roberta Cristina Sesana²  Milthon Honorio Munoz Berrocal¹  Leonardo De Oliveira Seno²  Annaiza Braga Bignardi²  Lenira El Faro¹  Lucia Galvão De Albuquerque²  Gregório Miguel Ferreira De Camargo²  Humberto Tonhati² 

[1] ,Universidade Estadual Paulista 'Júlio de Mesquita Filho' Faculdade Ciências Agrárias e Veterinárias Jaboticabal SP ,Brazil

关键词: test-day model;    accumulated productions;    heritability;    genetic correlations;   

DOI  :  10.1590/S1415-47572010005000005

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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