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.: Home > Animal Science Papers and Reports > 2010 > Volume 28 Number 1 > Bin Bao1, Chunlei Zhang1, Xingtang Fang1, Runfeng Zhang2, Chuanwen Gu1, Chuzhao Lei2, Hong Chen1,**

Association between polymorphism in STAT5A gene and milk production traits in Chinese Holstein cattl

Bin Bao1, Chunlei Zhang1, Xingtang Fang1, Runfeng Zhang2, Chuanwen Gu1, Chuzhao Lei2, Hong Chen1,**
1 Institute of Cellular and Molecular Biology, Xuzhou Normal University, Xuzhou 221116, Jiangsu,China, 2 College of Animal Science and Technology, Northwest A&F University/Shaanxi Key Laboratory of Biology for Agriculture, Yangling 712100, Shaanxi, China
Abstract :

STAT5 is a key intracellular mediator of prolactin signaling and can activate transcription of milk proteins in response to prolactin. STAT5 genes are suggested to be candidate markers for milk protein yield and composition in dairy cattle. PCR-SSCP was applied to analyze the polymorphisms of two loci in STAT5A gene in 279 Chinese Holstein cattle. Genotype frequencies, allele frequencies and correlation coefficients between the polymorphic variants and milk production traits were estimated. Three genotypes were found at the two loci. At locus P1 the frequencies of genotypes AA/GG/AG were 0.240/0.147/0.613 and those of alleles A and G were 0.547 and 0.453, respectively. The A/G genotypes had significant effect on milk yield and milk protein content in lactations 1 and 2. At locus P2 the genotype frequencies of CC/TT/CT were 0.752/0.004/0.244 and C and T allele frequencies were 0.875 and 0.125, respectively. Different genotypes had remarkable effect on the milk protein content in lactation 2.

Keywords :
Chinese Holstein cattle, gene polymorphism, lactation, milk, SSCP, STAT5A

Date Deposited : 10 Jan 2011 15:55

Last Modified : 11 Jan 2011 11:21

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Volume 28, Number 1, - 2010

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