Environmental and genetic effects on visual scores and average daily weight gain at the weaning of animals used to form the Brangus breed

Revista Brasileira de Zootecnia

Costa, Gabriela Zoccolaro¹  Fries, Luiz Alberto²  Queiroz, Sandra Aidar de³  Oliveira, João Ademir de³ 

[1]GenSys Consultores Associados S/C Ltda

[2]UNESP, Jaboticabal

关键词: conformation;    environmental effects;    growth traits;    individual heterozygosity;    musculature;    precocity    Introdução Com a competitividade na pecuária de corte brasileira;    é necessário produzir carne de qualidade em sistemas de produção rentáveis;    o que requer;    entre outros;    o uso de animais adequados às condições do ambiente de produção;   

DOI  :  10.1590/S1516-35982009000200009

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective of this work was to study the effects of age of cow at calving (IPV) and age of calf at weaning (IDD) as well as the direct additive genetic effects (AD) and maternal (AM), and the individual heterozygosity (HI) on visual scores of conformation (CD), precocity (PD) and musculature (MD) and average daily weight gain from birth to weaning (GND), for animals used to form the Brangus breed. The study analyzed 53,683, 45,136, 52,937 and 56,471 records on CD, PD, MD and GND, respectively for animals born from 1986 to 2002. The data were provided by "Gensys Consultores Associados S/C Ltda". The environmental and genetics effects on these traits were analyzed using the least square method applying mathematical models that included fixed effects of contemporary group (GC) and IPV, IDD, AD, AM and HI as covariates. All environmental effects included in the model showed significant influence on the evaluated traits at weaning, except for IDD on GND and AM on all traits. All traits were significantly influenced by AD and HI. These results indicated that environmental and genetic effects were important sources of variation for these traits and, consequently, they should be considered in genetic evaluations.

【 授权许可】

CC BY-NC