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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-Alu I genotypes and milk EC ( p  &lt; 0.001) and between  STAT5A-Ava I genotypes and milk EC ( p  = 0.007), but there were not any significant relationships between  MYF5  gene polymorphism and the investigated traits ( p &gt;  0.05). The greatest EC values were observed in  GH-Alu I-LV and  STAT5A-AvaI- TT-genotyped individuals. Just because of association of EC with mastitis, it was concluded that present  GH-Alu I and  STAT5A-Ava I polymorphisms could be used in further studies to be conducted to improve mastitis resistance and milk quality traits of Holstein dairy cows.

Association of GH, STAT5A, MYF5 gene polymorphisms with milk somatic cell count, EC and pH levels of Holstein dairy cattle