Alpha-S1 Casein Gene Polymorphism and Association with Milk Production Traits in Sahiwal and Holstein Frisian Crossbred Cattle

The present research work was conducted on 100 lactating cows comprising 50 each of Sahiwal and HF Crossbred cattle. All the screened in Sahiwal (n = 50) and HF Crossbred (n = 50) cows revealed monomorphic pattern, only, AA genotype (310 bp) was found at αs1-casein gene (CSN1S1)/HindIII locus. The allelic frequency for allele A in the screened animals of Sahiwal and HF Crossbred cattle was 1.00 and for allele B was 0.00. The population was found under HWE at this locus (χ²=0.00^NS). Milk yield and Daily milk yield was noticed significantly higher in HF Crossbred as compared to Sahiwal cattle.