Influence of animal origin adaptogen on stress level and milk productivity of Holstein cows

The article is devoted to the study of the influence of industrial stress on the body of lactating cows at the dairy complex “Molochnaya Fabrika” LLC. The study was conducted on Holstein cows of the 1st lactation showing signs of stress. Average daily milk yield, mass fraction of fat and protein in milk were taken as stress markers. To reduce the stress level, a freeze-dried biologically active additive from antlers of the European red deer, which is bred in Kaliningrad region, was used. The study was conducted during 2023 at the dairy complex. Animals were divided according to the principle of pairs-analogues. Experimental and control groups of 10 heads each were formed. The product was administered orally at 20 grams per head, dissolved in 400 ml of water, in addition to the main diet, once a day for 25 days. Generally accepted zootechnical and veterinary techniques and methods were used to organize the experiment. A package of office programs was used to process the obtained data. The assessment of productive characteristics was carried out by the method of control milking. An ultrasonic milk analyzer “Clover-1”, was used to assess milk samples. As a result of using the mineral supplement, an increase in the average daily milk yield was recorded in animals of the experimental group, which was 9.5% higher than in the control group. The mass fraction of protein in milk was 0.13% higher than in the control, and the mass fraction of fat increased by 0.1%, respectively. The effectiveness of the supplement was proven experimentally. A decrease in the stress level, stable milk yields, and the mass fraction of fat and protein, which slightly increased by the end of the experiment, were noted. The mineral supplement is recommended for the main diet as an adaptogen that increases the body’s resistance to stress on a dairy complex.