Evaluating the genes of BLTF, BGH and BPRL in cows of Tatarstan type on resistance to mastitis

In the «Biryuli» breeding factory of Tatarstan type cows, the resistance to mastitis depending on their genotypes at the loci of lactoferrin (bLTF), prolactin (bPRL) and somatotropin (bGH) was studied. As a result of the research it was established that in the cows of the Tatarstan type all three studied loci of proteins turned out to be polymorphic: along them, loci in LTF and in PRL had an average level of polymorphism, and in GH - low one. The possible association of these loci with the resistance to mastitis can only be said about one locus - prolactin, which revealed significant differences between healthy and sick animals according to the frequency of AA and AB genotypes. The advantage of this was the AA genotype.