Vol. 12, Special Issue 7 (2023)

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

Abstract:
Present study revealed that polymorphic variants and their association with milk production traits at κ-casein gene (CNS3) locus in Sahiwal and HF Crossbred cow. The frequency of A allele was found to be higher 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 Sahiwal breed of cattle, indicating that the populations of these animals were in Hardy-Weinberg equilibrium at this locus, while the Chi-square value was found to be significant (p<0.05) for HF crossbred cattle revealing the Hardy Weinberg disequilibrium at this κ-casein (CSN3) gene locus. Association of polymorphic variants of κ-Casein (CSN3) gene with lactation length (LL), Fat (%) and protein (%) revealed that the mean LL of AA genotype of Sahiwal was significantly higher than AB genotype, while this difference was found to be non significant between AA and AB genotypes of HF crossbred cattle. With respect to mean value of Fat (%) There was a non significant difference between AA and AB genotypes of Sahiwal and HF crossbred cows, while the breed wise difference was found significant in HF crossbred with Sahiwal. Comparatively lower fat (%) was noticed in AA genotype of HF crossbred. The least square means for protein (%) in Sahiwal and HF crossbred cattle showed non-significant difference between AA and its own AB genotype.