Morphological changes in muscle tissue of bulls after the use of apiadaptogens

Relevance . This paper presents the results of a study examining the effect of an apiadaptogen on the performance of Bestuzhev bulls and morphological changes in muscle tissue. Methods . The bulls were given drone brood homogenate as a tincture in their basic diet at a dose of 0.005 ml per 1 kg of body weight for Group II (experimental), 0.01 ml for Group III (experimental), and 0.015 ml per 1 kg of body weight for Group IV (experimental). Group I was the control group. The effectiveness of the test component was determined based on a range of intravital parameters, including live weight, average daily gain, slaughter indicators, chemical composition, the biological value of carcass flesh and raw fat, and morphological changes in muscle tissue. Results . The change in live weight indicates that at the age of 18 months, the young animals of the III (experimental) group surpassed all their peers: I (control) group — by 22.1 kg, II (experimental) — by 9.5 kg and IV (experimental) group — by 1.7 kg, in terms of absolute live weight gain over the entire experimental period — by 22.1 kg; 9.4 and 1.8 kg, respectively. In all age periods, among the young animals of the experimental groups, the Bestuzhev breed bulls of the III (experimental) group demonstrated a higher average daily gain, amounting to 696.70 to 797.80 g. Slaughter qualities and chemical composition of the longissimus dorsi muscle were better in animals of the III (experimental) group, whose diet included drone brood homogenate at a dose of 0.01 ml / kg of body weight. Histological examination of muscle tissue from bulls fed drone brood homogenate revealed normal muscle structure, while control animals showed some signs of dystrophic changes, including impaired protein and carbohydrate metabolism and mild lipid metabolism. Thus, a comprehensive analysis demonstrates the beneficial effects of drone brood homogenate, which demonstrated its adaptogenic properties with the best results at a dosage of 0.01 ml per 1 kg of live weight, which was administered to bulls in Group III (experimental).