Addition of aspen bark phytobiotic at a dose of 35 mg/kg of body weight and lactic acid prebiotic at a rate of 0.5 ml/kg of feed to compound feed for broiler chickens, both separately and together had a positive effect on the digestibility of the organic part of the feed. The greatest effect was demonstrated by the combined use of the phytoprebiotic additive. Thus, the digestibility of crude protein was higher than in the control group by 1.33 abs.% at three weeks and by 2.37 abs.% at six weeks of age, and crude fat by 4.92 and 5.28 abs.%, respectively. Aspen bark decoction changed the digestibility of organic matter to a lesser extent. Thus, the difference in crude protein was 0.60 and 1.49 abs.%, crude fat 3.31 and 4.28 abs.%, crude fiber 1.27 and 2.02 abs.%, respectively, at the age of three and six weeks. With the same intake of gross energy of the diet by broiler chickens in the rearing periods, the value of metabolism energy in the group with one phytobiotic was higher than the control group by 2.3 % at three weeks and by 1.3 % at six weeks. In the group with a prebiotic the difference was 4.7 % only in the first rearing period, with complex use by 6.2 and 1.8 %. In broilers of all groups the total amount of metabolism energy of the maintenance feed did not differ significantly. If the net productive energy in the control group was at the level of 0.95 MJ, then in the group with the addition of phytobiotic at the age of three weeks it increased by 4.2 %, with the use of prebiotic it increased by 6.3 %, with their total use by 7.4 %, at six weeks its value in all groups was within the range of 1.33–1.35 MJ. Higher transformation of the organic part of the feed into the bird’s body increased the content of protein and fat in the meat, which ultimately had superiority in its energy value by 4.4 % in the group with phytobiotic, by 2.4 % with the addition of prebiotic and by 5.7 % with their complex use.

The most effective form of providing productive animals with nutrients remains high-quality compound feed. In order to realize the genetic potential of animals and poultry, it is necessary to look for ways to reduce the cost of compound feed without reducing the quality and balance of rations. Hulless barley characterized by a reduced content of difficult-to-digest fiber and therefore having increased nutritional value for poultry, is of particular relevance when introduced into compound feed. The purpose of the work was to determine the efficiency of using hulless barley in compound feed for broiler chickens. The results of the effect of complete, balanced compound feeds with nutrients with the introduction of 15 and 30 % of hulless barley instead of wheat in compound feed for broiler chickens of the cross Smena-9 have been presented in the article. The results to base on rearing of broiler chickens, a positive effect of experimental diets with the introduction of 15 and 30 % of hulless barley on the digestibility of feed nutrients was established compared to the control: by 2.35–3.06 abs.% for crude protein, by 1.72–2.47 abs.% for crude fat, by 7–9.51 abs.% for crude fiber, by 0.63–1.22 abs.% for nitrogen-free extractive substances, which led to a lower average daily feed intake by 3.56 and 5.00 %. Due to the increased digestibility of nutrients, the live weight increased by 3.90–5.79 % (p < 0.001) and the yield of breast muscles by 17.25–27.29 %, while feed costs per 1 kg of live weight gain decreased by 6.67–9.59 % and the cost of 1 kg of broiler meat by 2.53–5.09 %. The use of hulless barley in feeding of broiler chickens allow us to increase the nutritional value of meat by increasing its protein content by 0.96–1.68 % (p < 0.001).

In our country dairy farming is gradually turning into a specialized branch of industrial animal husbandry, providing for the needs of the entire population in milk, dairy products and beef. Despite the fact that the economic efficiency and expediency of using enzyme drugs in feeding of farm animals is currently beyond doubt, interest in this problem does not wane. The purpose of the work was to analyze the nutritional value of rations of cows of Black-and-White breed when use enzyme additives of domestic and foreign production. The intake of feed mixtures by cows in the experimental groups was at the level of 93.7 and 95.3 %, and in the control group 88.9 % of the daily ration. The concentration of metabolic energy in 1 kg of dry matter was at the level of 9.89 MJ. Per one EFU in the ration there were digestible protein 94.43 g; crude fiber 195.55 g; crude fat 35.11 g. Crude protein in dry matter of the ration accounted for 13.95 %; crude fat 3.50 %; crude fiber 19.55 %, which met the needs for highly productive cows. Animals of the experimental groups received almost the same amount of nutrients and energy as the cows of the control group. The concentration of metabolic energy in 1 kg of dry matter of the ration in cows of the 1st experimental group was 10.04 MJ and in the 2nd group 10.51 MJ. The conducted analysis of the nutritional value of rations of cows of Black-and-White breed during the period of increasing of milk yield showed that when using enzyme additives of domestic and foreign production Cellobacterin in the amount of 25 g/head/day and Fibrozyme 15 g/head/day, they fully provide the needs of lactating cows for the main nutrients for the production of high-quality milk.

It is well known that the growth rate of an animal depends on the level of feeding. However, the diets used in farms do not always satisfy the body’s needs for biologically active substances. That is why the issues of increasing the fattening and meat traits of pigs depending on the feeding conditions during the rearing period remain extremely relevant. The purpose of the work was to determine the dependence of meat and slaughter traits of young pigs on feeding conditions during the rearing period. The studies were carried out under the conditions of industrial technology of the pig complex Vostochny LLC in the Udmurt Republic. N order to reduce the cost of pig production, an experiment was conducted on rearing pigs by changing the feeding scheme for young animals. In the control group, young animals during rearing received PCF-3 (Pigs Compound Feed) compound feed from the moment of weaning to 45 days of life, then from 46 to 65 days they were transferred to PCF-4, at the final stage of feeding during the rearing period, young animals consumed PCF-5 until the moment of transfer to the fattening site. Pigs of the 1st and 2nd experimental groups were fed PCF-4 from the moment of weaning to 65 days during rearing, and piglets of the 1st experimental group were transferred to PCF-5 from the age of 66 days, and those of the 2nd experimental group were transferred to PCF-6 until the moment of transferring the livestock for fattening. The results on obtained on experimental base during the research, in order to improve the fattening and meat traits of young pigs under the conditions of industrial technology of the pig complex of Vostochny LLC in the Zavyalovsky district of the Udmurt Republic, it is recommended to use compound feed PCF-4 during the rearing period of young pigs from 28 to 65 days, and compound feed PCF-5 from 66 to 80 days.

Under the conditions of intensive sheep breeding technology, special attention is paid to the production of compound feed and complete feed mixtures. In recent years, in the production of compound feed for lambs, various feed additives have become widespread, most of which are imported, which leads to an increase in the cost of compound feed. The purpose of the work was to develop a recipe for a new feed additive based on local feed resources, study the effect of replacing part of the granulated compound feed with the developed protein-vitamin-mineral concentrate (PVMC) in different proportions depending on the age of lambs to obtain high-quality mutton from them and increase their meat productivity, as well as the efficiency of rearing for the reproduction of crossbred young ewes. A scientific justification for the development of PVMC under the conditions of the Central Black Earth Region of Russia for including it in the ration of early weaned crossbred lambs (Tsigai×Edilbaevskaya) has been provided in the work. The efficiency of feed use is assessed. The effect of PVMC on meat productivity in young rams and wool productivity in young ewes has been established. The optimal option for replacing part of the compound feed with PVMC has been established, which allowed improving the quality of meat and meat productivity. In order to increase the precocity, livability and productivity of young sheep in farms breeding crossbred sheep under the conditions of the Central Black Earth Zone of the Central Region of the Russian Federation of various types of ownership, it is recommended to include the developed PVMC when rearing early weaned lambs for the age of 2–4 months in the amount of 30 %, 4–6 months – 25 % and 6–8 months – 20 % of the mass of the fed compound feed.

The use of alternative protein sources in feed production is a promising direction for increasing the productivity of farm animals and reducing costs. The purpose of the research was to assess the effect of protein concentrate from Hermetia illucens larvae on the productive characteristics of poultry, growth dynamics, feed conversion ratio, slaughter parameters, as well as the economic feasibility of its use in industrial poultry farming. A production test was carried out including the formation of two groups of broilers with 100 heads in each, where the experimental group received compound feed with fish meal (75 %) replaced by protein concentrate. The results showed that the average live weight of broilers in the experimental group by the 35th day increased by 127.8 g (2193.5 g versus 2065.7 g in the control group), the average daily weight gain was 61.54 g (+3.64 g), and feed costs per 1 kg of gain decreased from 1.50 to 1.40 kg. The slaughter yield also increased (from 71.28 to 74.97 %), which confirmed the high nutritional value of the tested concentrate. The assessment of economic efficiency showed a decrease in the cost of compound feed by 3.40 rubles/kg and an increase in the level of profitability of production from 8.1 to 23.6 %. The introduction of protein concentrate based on Hermetia illucens larvae in poultry feed diets demonstrates a positive effect, since the productive characteristics of the livestock are increased, feed costs are optimized and production profitability increases. These factors justify the need for largescale use of this ingredient in industrial feed production as an innovative tool for sustainable development of the industry. The use of protein concentrate from Hermetia illucens larvae helps to increase poultry productivity, reduce feeding costs and increase production profitability, which confirms the prospects for its implementation in industrial feed production.