Abstract

This study was conducted to ivnestigate the associations of GH-AluI, STAT5A-AvaI and MYF5-TaqI gene polymorphisms with milk somatic cell count (SCC), electrical conductivity (EC) and pH levels in Holstein dairy cows. For this purpose, 167 blood and 1670 milk samples of 167 Holstein cows in their 2nd lactation were used. There were significant relationships between GH-AluI genotypes and milk EC (p < 0.001) and between STAT5A-AvaI genotypes and milk EC (p = 0.007), but there were not any significant relationships between MYF5 gene polymorphism and the investigated traits (p > 0.05). The greatest EC values were observed in GH-AluI-LV and STAT5A-AvaI-TT-genotyped individuals. Just because of association of EC with mastitis, it was concluded that present GH-AluI and STAT5A-AvaI polymorphisms could be used in further studies to be conducted to improve mastitis resistance and milk quality traits of Holstein dairy cows.

摘要

本研究旨在探讨GH-AluI、STAT5A- AvaI和MYF5-TaqI基因多态性与荷斯坦奶牛的乳体细胞计数 (SCC)、电导率 (EC) 和 pH 水平的关联。为此，使用了 167 头荷斯坦奶牛第二次泌乳的 167 份血液和 1670 份牛奶样本。GH-Alu I基因型与乳EC（p <  0.001）和STAT5A-Ava I基因型与乳EC（p = 0.007）之间存在显着相关性，但MYF5基因多态性与所研究性状 之间没有任何显着关系（ p >  0.05)。最大的 EC 值在GH-Alu I-LV 和STAT5A-AvaI- TT 基因分型个体。正因为 EC 与乳腺炎相关，所以得出的结论是，目前的 GH-Alu I 和STAT5A-Ava I 多态性可用于进一步研究，以改善荷斯坦奶牛的乳腺炎抗性和牛奶质量性状。