Abstract
The purpose of the study was to provide an economic justification and calculate the profitability of milk production when using Lamarin Saldonum bio additive in the diets of highly productive cows in different physiological periods, as well as to determine the amount of damage prevented through the use of this additive. The experiment was conducted in 2021 on four groups of full-aged Holstein cows (3 experimental and 1 control, 10 heads each). Cows of all three experimental groups received the bio additive Lamarin Saldonum at a dose of 0.4 g/kg body weight everyday for 60 days. The start of feeding the supplement in the first group was 30 days before the expected calving, in the second – 60 days before the expected calving, in the third – on the day of calving, the fourth control group did not receive the supplement. The calculation of the economic efficiency of using the additive in diets of cows and the profitability of milk production, as well as the prevented damage from cow's infertility, was carried out using generally accepted methods. In the course of the study, it was found that the most effective is the inclusion of Lamarin Saldonum in the diets of cows in the late dry and early post-calving periods (the first group). This is confirmed by a decrease in the cost of milk production by 9.11 % due to an increase in gross yields, reducing the cost of fruitful insemination of 1 head by 650 rubles, a decrease in the total economic damage from cows' infertility by 25,927.58 rubles per head, and increase in the profitability of milk production by 14.35 percentage points compared with the control group. In addition, using Lamarin Saldonum according to the specified period makes it possible to get 3.36 rubles of additional profit and 9.00 rubles of prevented damage per 1 ruble of additional costs.