Analysis of cows of holsteinized black and white breed on the FSHR gene polymorphism

Abstract

The fertility of cows is a polygenic trait, the development of which is determined by the complex interaction of various genes and environmental factors. The aim of our work was to study the polymorphism of the FSHR gene in exon 10 in cows and analyze the connection of its allelic variants with productive and reproductive parameters, as well as with the quality and quantity of oo cyte-cumulus complexes (CCM) (obtained from post mortem ovaries..The indicator of fertility of cows is one of the most important parametres, determinating the level of breeding and economic wellness of agricultural enterprises. Since the signs of milk production and fertility of cows very often are in a negative correlation, in our work we analyzed not only a number of economically valuable features, but also studied the reproductive potential of highly productive cows of black-and-white Holstein breed. In the analyzed samples (n=69 cows or 138 ovaries) 3 genotypes were determined: FSHR gene: CC (52 cows), CG (13 cows) and GG (4 cows). There was a tendency of reduction of the breeding value (BV) for milk yield, milk fat and protein from the CC genotype to the GG genotype. A weak positive correlation was found on the signs of BV milk and milk fat with the total yield of oocyte-cumulus complexes (OCC) (correlation coefficient 0,164 and 0,108, respectively). According to the results of the study, we can conclude that the FSHR gene in cattle does not sufficiently reflect the quantitative and qualitative characteristics of OCC obtained from post mortem ovaries.