Reproductive function and dairy productivity of cows when applying Lamarin Saldonum

The experiment was conducted on the basis of the agricultural production cooperative kolkhoz "Iskra" (Kirov region) in 40 highly productive cows of black-motley Holstein zed breed, which were divided by the method of paired analogues into 4 groups of 10 heads. The influence of the biologically active additive Lamarin Saldonum on the reproductive function and the milk productivity of cows was studied. The animals of the experimental groups were given the additive daily in doses of 0.1, 0.2 and 0.3 g per 1 kg of live weight for 30 days before calving during 60 days. It has been established that Lamarin Saldonum does not negatively affect the duration of pregnancy, while it helps to reduce the number of generic and postpartum diseases. In cows of the experimental groups retention of placenta was registered 10-20 % less often and the development of postpartum endometritis was observed 10-30 % less often. It was also found that in the animals of the experimental groups the indifferent period was reduced by 8.13-14.49 %, the number of days from calving to fruitful insemination was decreased by 30.51-53.82 days, the number of days of infertility was reduced by 33.63-59.37 % compared to intact animals. The cows of the second experimental group showed the best milk productivity, where the gross milk yield exceeded the values of the control group in the first month of lactation by 19.63 %, in the second - by 13.43 %, in the third - by 39.87 %. The need for additional studies to determine the effective dose of the additive Lamarin Saldonum, which will have a stimulating effect on the reproductive function of high-productive cows, has been established.