Genetic polymorphism and association of kappa-casein gene with milk production traits among Frieswal [HF x Sahiwal] cross breed of Indian origin

ABSTRACT

The aim of the present study was to screen the genotype profile of bovine kappa-casein gene among Frieswal [HF x Sahiwal] crossbred cattle developed in India. A total number of two hundred Frieswal cows were evaluated for Hinfl RFLP based genotyping of kappa-casein gene. We observed that only two genotypes [AA and AB] exist among the studied population with the genotype frequency of 0.58 [n=117] and 0.42 [n=83], respectively. The calculated allele frequency for A and B was 0.79 and 0.21, respectively. Association of genotypes with certain milk production traits revealed that AB had significant [P<0.05] effect on total milk yield, peak yield, yield at 300 days and SNF% as compared to AA