Vol. 12, Special Issue 6 (2023)

Author(s):
Anuj Kumar Yadav, Akhilesh Pandey, DS Gonge, Shivani Choudhary and Y Pandey

Abstract:
The present study was carried out for the determination of β-casein genetic variants (A1 and A2) in Gir and HF crossbred cows of Madhya Pradesh along with its association with milk production traits at β casein gene. The frequencies of A1A1, A1A2 and A2A2 genotypes were found to be 0.00, 0.00 and 1.00 in Gir breed of cows and 0.00, 0.60 and 0.40 in HF crossbred of cow, respectively. The respective gene frequency for A1 and A2 alleles were found to be 0.00 and 1.00 in Gir breed and 0.30 and 0.70 in HF crossbred of cow. Higher frequency of A2 allele was observed in Gir breed of cows as compared to HF crossbred of cows under the study. Chi - square values between observed and expected genotypic frequencies at this locus were found to be non-significant in Gir breed of cows, indicating that the populations is in Hardy-Weinberg Equilibrium for these group of animals, while Chi-square values was found to be significant for HF crossbred cows revealing that this populations is in Hardy-Weinberg disequilibrium. A1A2 genotype of HF crossbred showed significantly higher MY than A2A2 genotype among both breeds of cows. Significantly higher fat percent was recorded in A2A2 genotype of Gir as compared to HF crossbred cows. The mean protein per cent in the milk of Gir for A2A2 genotype was significantly higher than milk of both genotype (A1A2 &A2A2) of HF Crossbred.