The aim of the studies was to evaluate the effect of adding sodium dimethyl glycinate in broiler diets, as part of a feed additive to increase the digestibility of feed nutrients, improve health and increase the meat productivity of broilers. During the experiment, the prevalence of live weight was established by 77 g (3.81%) in the experimental group, with a reduction in feed costs per 1 kg of gain by 0.05 kg. Safety in the experimental group was 100%, and in the control - 97.5. The European efficiency index increased by 35.18 points and amounted to 389.35. An increase in the digestibility of nutrients obtained from feed by the body of broilers: dry matter - by 1.44, protein - by 1.25, fat - by 2.74, nitrogen-free extractive substances - by 1.67%. The mass of the pectoral muscles increased by 78 g, which confirms the high digestibility of nutrients in the feed. Sodium dimethylglycinate has also been shown to improve the immune system and reduce oxidative stress in broiler chickens. Activation of enzymes of the antioxidant status was observed under the influence of the studied additive: superoxide dismutase by 8.32%, ceruloplasmin by 9.47%, and the level of malondialdehyde decreased by 5.63%.

Among veterinary drugs and feed additives, antibacterial agents occupy a special place, which are used not only for the prevention and treatment of bacterial diseases, but also as powerful growth stimulants. It is known from numerous publications that antibiotics used in the poultry industry pose a serious threat to human health. This article presents the results of studies of the effectiveness of the feed additive FRA® S12 and dietary supplement “Lactusil”, as an alternative to the antibacterial drug of the class of cephalosporins, when growing broiler chickens. Feed additive FRA® S12 and dietary supplement “Lactusil” had the most significant effect on the meat productivity of chickens in II and III experimental groups in comparison with the antibiotic drug (test I group). The excess in live weight was 3.09 and 2.58%, the slaughter yield - by 0.9 and 0.4%, the weight of the pectoral muscles - by 16 and 10 g, the yield of grade I carcasses - by 6.9 and 6.2% … The level of erythrocytes in the blood of chickens in test groups II and III was higher than in test group I by 19.87 and 15.06%, the hemoglobin concentration - by 6.37 and 5.42%, the hematocrit content - by 3.28 and 2, 83. The results obtained substantiate the possibility of replacing antibiotic drugs when growing broiler chickens with alternative ones: feed additive FRA® S12 and dietary supplement “Lactusil”.

The basis of automotive equipment used in agricultural enterprises are tractors, cars and self-propelled combines. They are equipped with internal combustion engines, the design feature of which is the presence of replaceable, so-called “wet” cylinder liners. Nevertheless, engines with an integral cylinder block design have also found applications at the enterprises of the agriculture-industrial complex. It is important to develop a mathematical model that allows calculating the force of pressing the sleeve into the block, while designing the technological process of cylinder block linings for such engines. Regarding this, the Department of energy resources and technical services in Vologda State Dairy Academy Named after N. V. Vereshchagin conducted an experiment, which is based on force measurement for press fitting the sleeve into the engine block and comparison of the measurement results with the results of theoretical calculations according to Lamet formulas. Relying on the results of the experiment, the method (Lamet formula) is deemed to be applicable to determine the force of pressing the sleeve into the engine cylinder block with optimal tension, which is valid for thick-walled cylinders.

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Aim. Study of the effectiveness of the use of the feed additive "Mega HenOn" in the training of chickens of an industrial herd of the cross "Highsex brown" under heat stress. Materials and Methods. Evaluation of the efficiency was carried out for 32 weeks on industrial chickens in the amount of 70 heads. During the experiment, the egg production of chickens (daily), feed costs, and the category of eggs were taken into account. To determine the quality characteristics of edible eggs, GOST 31654-2012 “Edible hen eggs. Technical conditions". Results. The studied additive had a positive effect on the egg productivity of chickens, both during heat stress and during normalization of the temperature regime. At the age of 47-50 weeks (June-July, the ambient temperature during the daytime increased to 38-40°C), egg production dropped sharply, and in the control group it was 79.03%, and in the experimental group, despite the decrease, it exceeded this indicator by 3.63%. At the age of 51-58 weeks (July-August, the increase increased to 36°C), the decrease in egg production continued, but in comparison with the previous period, there was a certain trend towards recovery, which amounted to 85.51%, exceeding the control by 2.22%. The studied feed additive, to some extent, neutralized the negative effect of heat stress on the body of birds. In general, over the period of the experiment, the egg-laying intensity in the experimental group was 89.1%, and in the control group - 87.09%. The cost of producing 10 eggs in the experimental group is 1.29 kg, which is 0.07 kg less than in the control group. The yield of eggs of the category "superior" and "selected" in the experimental group exceeded the control by 0.53 and 16.89%. The yield of eggs of the II category turned out to be higher in the control group and amounted to 29.56%, which is higher than in the experimental group by 13.73%. Conclusion. The use of the innovative “Mega HenOn” feed additive, in the diets of chickens during the heat stress period, contributed to a more complete realization of the genetic potential of birds, due to the stabilization of metabolic processes in the body of birds, an increase in egg production, a decrease in the yield of culling eggs and, as a consequence, an increase in the level of profitability by 2.38%.