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    • Keywords


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

    • Abstract


      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 geno-types. Frequencies of genotypes were 0.77, 0,21 and 0.02 for A/A, A/B and B/B, respectively. The frequency of theGHA allele is 0.875.

      The results of the least squares means show that in all three lactations, theGH A/A cows yielded more milk (P < 0.01 for lactation I andP 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 II, andP < 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).

    • Author Affiliations


      Guo Li Zhou1 Hai Guo Jin1 2 Chen Liu1 2 Shan Li Guo1 Qi Zhu1 Yu Hou Wu1

      1. College of Life Science, Liaocheng University, Liaocheng, Shandong - 252059, People’s Republic of China
      2. Branch of Animal Husbandry Jilin Academy of Agricultural Sciences, Gongzhuling, Jilin - 136100, People’s Republic of China
    • Dates

  • Journal of Biosciences | News

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      Posted on July 25, 2019

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