Inheritance of protein milk production of cows of different breeding

Abstract

Modern cattle breeding now faces many challenges, one of the main is to improve existing and develop new methods for assessing individual breeding qualities of animals. Thesolutionto thisproblemrequiresstudyingthenatureof the inheritance of productivity traits. An open and poorly studied sign in cattle with interbreeding remains protein milk production of cows. This trait belongs to the category of quantitative traits and is controlled by a large number of complexly interacting genes, the manifestation of which is more dependent on the influence of paratypical factors. This fact seriously complicates breeding work and requires a thorough study of the nature of inheritance of milk protein in cross-breed animals, since it is known that animals have completely different genotypes. Signs of milk production of cows, which include the amount of milk yield, mass fraction of protein, mass fraction of fat are quantitative. Quantitative traits are determined by both the genotype and environmental conditions. In modern domestic and foreign literature there is an opinion that the nature of the inheritance of quantitative characters in interbreeding indicates an intermediate inheritance of these characters with a rather large range of variability in the first generation and increasing diversity in the second generation. That is why the purpose of this work is to study the inheritance of milk yield, the mass fraction of fat and protein in cows of German and Leningrad breeding, as well as in their ancestors.