Types of lactation curves and coefficient of persistence of lactation in cows with different genotypes of kappa-casein

In this study, we studied nature of activities for lactation in cows of Kholmogorskaya breed the Tatarstan type with different genotypes of kappa-casein. Studies have shown that in comparison with analogues with the AA genotype of kappa-casein greatest monthly milk yield in animals with genotype AB and BB. In all animals with different genotypes of kappa-casein is quite high coefficients of persistence for lactation 91,9-93,4. The results of our research are similar to results of other scientists.