Realizing the significant association of A1 and A2 β-casein (CSN2) polymorphism with health promoting properties and milk performance traits, the present investigation was undertaken to explore A1/A2 polymorphism in Indian zebu breed, Ongole (Bos indicus) and crossbred, Frieswal (HF × Sahiwal) cattle using allele-specific (AS)-PCR. Thirty eight Ongole cow, 124 Frieswal heifers and 48 Frieswal b...