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| Genetic parameters for somatic cell score and production traits in the first three lactations of Chinese Holstein cows |
| ZHAO Fu-ping, GUO Gang, WANG Ya-chun, GUO Xiang-yu, ZHANG Yuan, DU Li-xin |
1、National Center for Molecular Genetics and Breeding of Animal, Institute of Animal Sciences, Chinese Academy of Agricultural
Sciences, Beijing 100193, P.R.China
2、Beijing Sanyuan Dairy Cattle Breeding Center, Beijing 100076, P.R.China
3、College of Animal Science and Technology, China Agricultural University, Beijing 100193, P.R.China |
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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 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.
Abstract 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.
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Received: 16 December 2013
Accepted:
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| Fund: the 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) and the Chinese Academy of Agricultural Sciences Foundation (2012cj-2). |
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Corresponding Authors:
ZHANG Yuan,E-mail: changy@cau.edu.cn; DU Li-xin, E-mail: lxdu@263.net
E-mail: lxdu@263.net
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| About author: ZHAO Fu-ping, E-mail: zfpcau@gmail.com; GUO Gang,E-mail: guogang2180@126.com;* These authors contributed equally to this study. |
Cite this article:
ZHAO Fu-ping, GUO Gang, WANG Ya-chun, GUO Xiang-yu, ZHANG Yuan, DU Li-xin.
2015.
Genetic parameters for somatic cell score and production traits in the first three lactations of Chinese Holstein cows. Journal of Integrative Agriculture, 14(1): 125-130.
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