Abstract
The aim of the study was to estimate the effects of the CAPN316 , CAST282, GH L127V , GHR F279Y and A257G on milk yield, fat and protein yield and content on daughters produced by dairy sires. 24 dairy sires were 100% Holstein (14), 100% Brown Swiss (5) and Holstein mixed with another dairy breeds (5). Analyses included data on 32733 daughters for 2014-2017 years. Molecular genetic analysis was performed by PCR-RFLP. Statistical analysis revealed that population was on Hardy-Weinberg equilibrium. SNPs F279Y and A257G were not in linkage disequilibrium ( r 2 = 0.029, D’ = 0.074), because linkage of certain alleles was observed only in 7.4% of cases (D’). C -allele of SNP CAPN316 was strongly associated with protein content, despite C -allele of SNP CAST282 showed negative association with milk, fat and protein yield. Daughter milk performance traits (DMPTs) for SNP CAPN316 corresponded to CC>CG>GG pattern, except variations in milk and fat yield (kg). For SNP CAST282 Milk, fat and protein yield (kg) were significantly higher for CG than for CC genotype. C -allele for SNP L127V showed significant association and differences between genotypes with DYDs for fat yield (kg) – 20.45±5.53 ( P <0.01) and content (%) – 0.13±0.06 ( P <0.05), T -allele for SNP F279V was not significantly associated with any trait studied and A -allele for SNP A257G significantly associated with milk and fat yield (kg) for DMPTs/DYDs 1988.33±419.93/-269.69±89.92 ( P <0.01) and 84.30±15.64/-8.33±3.87 ( P <0.05). Results of this study reveal and support known advantages of SNPs studied in panels and selection programs.
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