文献类型： 外文期刊

作者： Zhou, GL ¹ ; Jin, HG ² ; Liu, C ² ; Guo, SL ² ; Zhu, Q ² ; Wu, YH ² ;

作者机构： 1.Liaocheng Univ, Coll Life Sci, Shandong 252059, Peoples R China

2.Liaocheng Univ, Coll Life Sci, Shandong 252059, Peoples R China; Jilin Acad Agr Sci, Branch Anim Husbandry, Jilin 136100, Peoples R China

关键词： Beijing Holstein cows;growth hormone gene;genetic polymorphism;milk production traits

期刊名称：JOURNAL OF BIOSCIENCES （ 影响因子：1.826； 五年影响因子：2.107 ）

ISSN： 0250-5991

年卷期： 2005 年 30 卷 5 期

页码：

收录情况： SCI

摘要： Associations were analysed between polymorphisms of the growth hormone gene (GH-MspI) (localized in intron 3) and milk production traits of Beijing Holstein cows (a total of 543 cows). Polymerase chain reaction (PCR)-restriction fragment length polymorphism (RFLP) method was used for identification of various genotypes. Frequencies of genotypes were 0.77, 0.21 and 0.02 for A/A, A/B and B/B, respectively. The frequency of the GH(A) allele is 0.875. The results of the least squares means show that in all three lactations, the GH A/A cows yielded more milk (P < 0.01 for lactation I and P < 0.05 for lactations II and III), whereas A/B cows showed higher milk fat content than A/A individuals (P < 0.05 for lactations I and , and P < 0.01 for lactation III). The A/A cows yielded more fat than A/B individuals (P < 0.01 only in lactation I). The A/A cows yielded more milk protein than A/B individuals (P < 0.01 for lactations I, II, and III). The A/A cows produced milk of higher protein content than of A/B individuals (P < 0.05 only in lactation II).