Vol. 12, Special Issue 6 (2023)

Author(s):
Anuj Kumar Yadav, Akhilesh Pandey and Y Pandey

Abstract:
The goal of work is identification of β - casein gene polymorphism along with its association with milk production traits in Gir and HF crossbred cows of Madhya Pradesh. The effect of genotypes was found significant (p<0.01) for Lactose per cent trait. The mean milk Lactose per cent ranged from 4.92±0.07 in A1A2 genotype of HF Crossbred to 4.97±0.09 in A2A2 genotype of HF crossbred cattle. Among A2A2 genotyped animals, the lactose per cent was significantly higher in Gir breed (5.93±0.07) as compared to HF crossbred cows. The effect of genotypes was found significant (P<0.01) for SNF per cent trait. The mean SNF (%) in A2A2 genotype of Gir was 8.66±0.12. The corresponding mean SNF (%) for A2A2 genotypes was 7.93±0.14 in HF crossbred cow. The mean SNF (%) of A2A2 genotype of Gir and HF crossbred differ significantly with each other. On the other hand there was no significant difference between A1A2 and A2A2 genotypes of HF crossbred cow was noticed. The effect of genotypes was found significant (P<0.01) for density (kg/L) trait. The mean milk density (kg/L) for A2A2 genotype of HF crossbred was 1.07±0.06 and for Gir cows was 1.04±0.05. Among both the genotypes, the higher milk density (kg/L) was noticed in A2A2 genotype of Gir breed of cow (1.07±0.06) cows whereas, it was significantly lower in A2A2 genotype of HF crossbred (1.02±0.04) cow. 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.