Vol. 9, Issue 1, Part R (2024)

Author(s): Akhilesh Pandey, DS Gonge and Y Pandey

Abstract: A numbers of casein polymorphisms exist in cattle also, making their analysis and association study quite complex. This study revealed the polymorphic variants and their association with milk production traits in Sahiwal and HF Crossbred cattle of Madhya Pradesh at αS2 casein gene (CSN1S2) gene locus. The RFLP analysis carried out in above both of the breeds of cattle revealed dissimilar genotypic patterns. The frequency of A allele was found to be highest as compared to B allele in above both breeds of cattle under the study. Chi-square values for testing correspondence between observed and expected genotypic frequencies at this locus were found to be non-significant in both Sahiwal and HF crossbred breeds. The above result indicated that the populations of animals of above both breeds were in Hardy-Weinberg equilibrium at this locus. The association of polymorphic variants of αS2-casein gene (CSN1S2) in both AA and AB genotype of HF crossbred breeds cow showed significantly higher milk yield per lactation than AA genotype of Sahiwal, whereas the AB genotype of HF crossbred showed significantly higher milk yield per lactation than its own AA genotype.