The presented study is dedicated to the influence of the polymorphism complex of κ-casein (CSN3) and prolactin (PRL) genes, which are responsible for milk quality and milk productivity. The study was carried out among Holstein first calf heifers by Integrated Agricultural Production Centre “Breeding farm named after Lenin” of Atninsky district of the Republic of Tatarstan. DNA samples were separated from blood samples of 261 cows for identification and genotyping according to kappa-casein and prolactin genes by PCR-RFLP analysis method.

As a result of the studies carried out on the chicken breed «High sex brown» it has been established that by applying forced molting it is possible to increase the period of industrial poultry use on average by 24 weeks what lets to raise egg production efficiency.

The results of field research conducted on soddy-podzolic light loam soil in the Vologda region established that the use of fertilizers significantly increased the yield of winter rye grain both against the background of the flavobacterin biofungicide and without its use. Depending on the doses of fertilizers and bacterialization with a microbiological preparation, the productivity of straw of winter rye naturally increased, the content of nitrogen, phosphorus, potassium in the production increased, the collection of crude protein by grain and the productivity in feed units increased.

The study on the therapeutic efficiency of drugs on anthelmintic such as al’vet, febtal granules, univerm, panacur pasta, equisect paste for nematodes in horses on the basis of the agricultural production cooperative “Breeding Stud Farm” “Vologodskij” and the Microbiology and epizootology chair of the Vologda State Dairy Farming Academy was presented.