Genetic parameters for somatic cell score and production traits in the ifrst three lactations of Chinese Holstein cows

ZHAO Fu-ping; GUO Gang; WANG Ya-chun; GUO Xiang-yu; ZHANG Yuan; DU Li-xin

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Genetic parameters for somatic cell score and production traits in the ifrst three lactations of Chinese Holstein cows

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The objectives of this study were to estimate genetic parameters of lactation average somatic cel scores (LSCS) and examine genetic associations between LSCS and production traits in the ifrst three lactations of Chinese Holstein cows using single-parity multi-trait animal model and multi-trait repeatability animal model. There were totaly 273605 lactation records of Chinese Holstein cows with ifrst calving from 2001 to 2012. Heritability estimates for LSCS ranged from 0.144 to 0.187. Genetic correlations between LSCS and 305 days milk, protein percentage and fat percentage were –0.079,–0.082 and –0.135, respectively. Phenotypic correlation between LSCS and 305 days milk yield was negative (–0.103 to –0.190). Genetic correlation between 305 days milk and fat percentage or protein percentage was highly negative. Genetic correlation between milk fat percentage and milk protein percentage was highly favorable. Heritabilities of production traits decreased with increase of parity, whereas heritability of LSCS increased with increase of parity.

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《农业科学学报（英文版）》 |2015年第1期|125-131|共7页
作者
ZHAO Fu-ping; GUO Gang; WANG Ya-chun; GUO Xiang-yu; ZHANG Yuan; DU Li-xin;
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National Center for Molecular Genetics and Breeding of Animal, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R.China;

National Center for Molecular Genetics and Breeding of Animal, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R.China;

Colege of Animal Science and Technology, China Agricultural University, Beijing 100193, P.R.China;

Colege of Animal Science and Technology, China Agricultural University, Beijing 100193, P.R.China;

Colege of Animal Science and Technology, China Agricultural University, Beijing 100193, P.R.China;

National Center for Molecular Genetics and Breeding of Animal, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R.China;

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Genetic parameters for somatic cell score and production traits in the ifrst three lactations of Chinese Holstein cows

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