Genetic trends for milk and fat yield in Holstein-Friesian cattle

被引：0
|
作者：
Tonhati, H [1 ]
Lobo, RB [1 ]
机构：
[1] USP,FMRP,SAO PAULO,BRAZIL
来源：
REVISTA DA SOCIEDADE BRASILEIRA DE ZOOTECNIA-JOURNAL OF THE BRAZILIAN SOCIETY OF ANIMAL SCIENCE | 1997年 / 26卷 / 04期
关键词：
milk production; Holstein-Friesian; genetic trends;
D O I：
暂无
中图分类号：
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号：
0905 ;
摘要：
The objective of this study was to estimate the genetic trends of the milk and fat yield in three herds maintained in Sao Paulo State, Brazil. The estimation of genetic, environmental and phenotypic trends were based on 716 first lactations. The cows were sired by 134 bulls. The statistical models included the fixed effects of herds, kind of gestation, season and year of the calving, age of the cow at calving, besides the random effect of the bulls. The statistical analyses, by the last squares method showed effects for bulls, herds and age of the cows on milk and fat yield. The genetic, environmental and phenotypic trends estimated were -10.20, 6.74 and -3.46 kg for milk yield and -1.90; 2.20 and 0.12 kg for fat yield.
引用
收藏
页码：714 / 718
页数：5
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