Genetic analysis of milk production and lactation period in Holstein cows according to BTN1A1 Gene Polymorphism

Abstract

The results showed that the Holstein BTN1A1gene has two alleles (A allele ) which is superior to the second allele (B allele )in the two values of the substitution effect and the average effect of the allele, and the homo genotype AA over the hetero genotype AB was successful in the breeding value of the two traits. It was also revealed through the new equations that the gene is responsible for the characteristic of milk production of the total output and the amount of 37725 Iraqi dinars of the full value of the milk price, and it also affects by ±7.24 days of the length of the milking season, which is estimated at 3583.8 Iraqi dinars. It is responsible for the inheritance of 70.09 kg of total milk production for 6.35 days/season length, reflecting the product's price value.The possibility of adopting the BTN1A1 gene within the selection programs to improve some productive traits, as well as the possibility of conducting a comparison between genes on the basis of the new equations, determining their contribution to the studied traits, and choosing the most influential gene to be an effective marker in the selection of quantitative traits. Keywords: Genetic analysis, Milk production, length of lactation, Holstein cows, BTN1A1 gene