The objective of this study was to describe the association between the milking frequency and milk production and to determine the effect of milking intervals on the functional properties of the udder of cows in automatic milking systems. Thousand eight milking recordings were enrolled in the study, in total, 106 Holstein cows were observed. The results of studies showed that at a daily milk yield per cow of 22.0 ± 0.6 (means ± SD) kg, the milking frequency was 2 times (13.5 % of the total number of milkings), 32.7 ± 0.4 kg -3 times (57.2 %), 37.7 ± 0.6 kg -4 times (28.0 %), 51.3 ± 4.1 kg -5 times (1.3 %). An increase in the daily milk yield due to a reduction in the milking interval has been established (P<0.001). However, milk yield per milking has the opposite tendency (P<0.001). The average and maximum milk flow rates increased with an increase in the milking interval and reached the highest values in the interval of 7.50-8.99 hours -2.36 and 3.36 kg/min, respectively (P<0.001). Cows with a low indicator of maximum milk flow rate (3.01 ± 0.06 kg/min) had greater milk production (36.6 ± 0.47 kg). With an increase in the milking interval from 4.50-5.99 to 7.50-8.99 hours, it was accompanied by a decrease in the latency period milk flow in the quarters of the udder, when the milking interval reached 9.00-10.49 and 10.50-11.99 hours, the latency period milk flow increased.

Development of inexpensive and environmentally friendly feed additives based on waste from the food industry and expired products as energy sources for animals is of current relevance and high demand. The study aimed to test the toxicological safety of ZeolFat energy feed additive (EFA) on laboratory animals. The tests on white rats showed that ZeolFat EFA is a low-toxic feed product with no cumulative properties revealed. The animals exhibited satisfactory physical state and a good appetite during experimental feeding. They were active, and their response to external stimuli remained similar to that before EFA introduction. ZeolFat EFA had a stimulating effect on carbohydrate and lipid, and mineral metabolism in rats, thereby ensuring a high increase in their live weight.

The article presents the results of research on the study of the raw milk properties of cows when adding an energy feed additive (ECD) based on activated zeolite to the diets. The work was carried out in the conditions of the MTF "Smak Kors" RT. The results of the study of the qualitative composition of milk-raw cows showed that ECD contributed to an increase in MJ in group I by 0.09 %, in group II-by 0.15 %, in group III-0.22 % (P<0.01) in relation to the control. According to the content of MDB in milk, the difference in the indicator was at the level of 0.04-0.14 %, respectively. The improvement of the quality composition of the raw materials had a positive impact on the cheese suitability. It should be noted that the positive effect increases with an increase in the dose of the test feed additive. The best cheese-making properties were characteristic of the milk of cows of the third experimental group. In them, under the action of rennet, a dense clot was obtained from the milk of 80.0 % and a loose clot was obtained in 20.0 %, and the milk had a short clotting time of 15.3 minutes. The milk of the cows of all experimental groups met the requirements of the desired type II.

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The introduction of the experimental energy concentrate "Zeolfat" in doses of 200, 400 and 600 g/kg per day into the main diet of lactating cows allowed to increase the content of raw fat by 6.69%, 13.38% and 19.91%; exchange energy by 1.46; 2.92 and 4.37%, respectively. As a result, the increase in average daily milk yields in terms of (3.4%) basic fat content was 8.1% in the I  group with the introduction of 200 g of concentrate, in the II  (400 g) -13.7, in the III  (600 g) - 14.3% compared to the control. A positive effect on the biochemical parameters of blood serum characterizing carbohydrate-lipid and mineral metabolism in the body was established. Economic efficiency per 1 RUB of additional costs in the experimental groups was 2.83-5.53 RUB, respectively.