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The aim of this study was to estimate the relations between the CRH-A787G polymorphism and milk production traits ( first lactation 305 days milk yield, first lactation total milk yield, first lactation 305 days protein and first lactation fat yield , as well as first lactation 305 days lactose and first lactation 305 days SNF yield) in 60 Karan Fries cows. The genotype and allele frequencies were estimated and they were as follows: AG – 0.63; AA – 0.37; A – 0.69; G – 0.31. Statistical analysis revealed that studied polymorphism significantly affected the first lactation 305 days milk yield, total milk yield, 305 days fat and SNF yield (P≤0.01). The results indicate that selection for the CRH-A787G, AG animals might contribute to increase the value of these traits in Karan Fries cattle. However, further studies are necessary to verify the results of our study.

Key words: Karan Fries cattle, Milk Yield, Milk Constituents traits.