Prevalence of A1 and A2 Beta-Casein Variants in Bushuev Cattle of Uzbekistan

produce only the A2 type of β-casein protein, also known as original milk, is gaining increasing popularity worldwide.Initially, only the A2 variant, possessing the A2A2 genotype of the β-casein gene, existed.The A1 variant arose as a result of a mutation that occurred during the selective breeding of high milk-yielding cows.These mutations have led to the formation of 13 variants of the β-casein gene, namely A1, A2, A3, A4, B, C, D, E, F, H1, H2, I, and G (Roginsky, 2003).The A1 and A2 variants Research

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