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

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

机构地区：[1]National Center for Molecular Genetics and Breeding of Animal,Institute of Animal Sciences,Chinese Academy of Agricultural Sciences [2]Beijing Sanyuan Dairy Cattle Breeding Center [3]College of Animal Science and Technology,China Agricultural University

出　　处：《Journal of Integrative Agriculture》2015年第1期125-130,共6页农业科学学报（英文版）

基　　金：fundings from the National Natural Science Foundation of China (31200927);the National Modern Agricultural Industry Technology Fund for Scientists in Sheep Industry System, China (CARS-39-04B);the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2011BAD28B02, 2012BAD12B06);the Chinese Academy of Agricultural Sciences Foundation (2012cj-2)

摘　　要：The objectives of this study were to estimate genetic parameters of lactation average somatic cell scores （LSCS） and examine genetic associations between LSCS and production traits in the first three lactations of Chinese Holstein cows using single-parity multi-trait animal model and multi-trait repeatability animal model. There were totally 273605 lactation records of Chinese Holstein cows with first 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.The objectives of this study were to estimate genetic parameters of lactation average somatic cell scores （LSCS） and examine genetic associations between LSCS and production traits in the first three lactations of Chinese Holstein cows using single-parity multi-trait animal model and multi-trait repeatability animal model. There were totally 273605 lactation records of Chinese Holstein cows with first 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.

关 键 词：somatic cell score genetic parameters Chinese Holstein single-parity multi-trait animal model multi-traitrepeatability animal model 

分 类 号：S823[农业科学—畜牧学]