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

作者：Zhao Fu-ping; Guo Gang; Wang Ya-chun; Guo Xiang-yu; Zhang Yuan^*; Du Li-xin

来源：Journal of Integrative Agriculture, 2015, 14(1): 125-130.

DOI：10.1016/S2095-3119(14)60758-9

• somatic cell score
• genetic parameters
• Chinese Holstein
• single-parity multi-trait animal model
• multi-trait repeatability animal model

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 273 605 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.

• 出版日期2015
• 单位中国农业大学; 中国农业科学院