The article presents the results of tests of protein-organic additives on pregnant female Arctic foxes. The criteria for assessing the impact on the productivity of females of arctic fox and the number of missing, poor and disadvantaged females gave birth, fertility, the number of mothers who are good reproduction, number of stillborn puppies, preservation of offspring before registration and the number of puppies in terms of the main female. During the experiments, it was found that the inclusion in the number of pregnant females should be 1,5 grams per day, which leads to a decrease in the number of stillborn puppies and, with, as a consequence, an increase in the number of young animals to be deposited.

Based on the materials of 23 fur-bearing animal farms of the Russia for different periods of years, a comparative assessment of the reproductive capacity of sable and mink females of standard breeds (wild type) has been carried out. It was established that during intrabreeding differentiation according to the overall color of the hair coat (almost black, black-brown, dark brown and chestnut), the lowest reproduction level is characterized by darker females of sable, which are a significant increase in the number of them, mated with male, but not given offspring (barren females). According to the results of interbreed comparisons of sables and minks, parallelism was found in the variability of the reproductive capacity of females, which is manifested in the fact that, in contrast to relatively light animals, animals that are dark in color are characterized by a greater number of barren females and low fecundity.

The results of researches on the infl uence of new metal and protein compounds in the feeding of rabbits and broiler chickens on the quality of meat have been presented in the paper. The researches have been aimed at solving the urgent problem of providing the population of country with complete-fl edged diets, which today account for up to 30 % of meat products. The paper shows that a lifetime change in the chemical composition and nutritional value of muscle tissue, obtaining functional foods is possible when correcting the micromineral part of the diet of animals through the use of metal and protein complexes Belmin and Chrombelmin. The use of modern research methods allowed us to determine the optimal rate of feeding these feed additives. The results have been shown that the inclusion in the diet of rabbits organic complex Belmin in an amount of 2,0 dose per head/day has increased content in muscle tissue of rabbits of iron (+37,8 %, P < 0,001), copper (+34,66 %, P < 0,001), zinc (+27,01 %, P < 0,001) and essential amino acids (+5,1–0,53 %). Feeding Chrombelmin to broiler chickens as part of compound feed (0,15 %) has increased the level of selenium in the chest muscle by 3 times (P < 0,001), in the femoral muscle – by 1,25 times. The content of manganese, zinc, and chromium changes slightly. In the breast muscle of broilers the lipid content has been increased by 1,37 % (P < 0,05), and in the femoral muscle it decreased by 1,11 % (P < 0,05). The use of metal and protein feed additives Belmin and Chrombelmin in animal husbandry increases productivity, as well as the production of meat products with the increase of content of micronutrients, which will provide the population with not only high-quality, but also useful for health food products.

In matters of animal feeding, scientists and practitioners pay great attention to the problem of improving the eff ectiveness of feed use by improving the digestibility and absorption of nutrients in diets when including enzymes, antioxidants, stabilizers, prebiotics and probiotics, fl avorings and other additives that optimize digestion and metabolism. Recently, it is important to use organic compounds of trace elements in animal diets in the form of chelated compounds, which allow reducing the rate of their input into the diet, ensuring more complete absorption of nutrients and realizing the genetic potential of animal productivity. The purpose of the researches was to establish the infl uence of the organicmineral complex Sebelmin on the meat traits of pigs and the economic eff ectiveness of pork production. Researches have been carried out on the basis of FSUE EF “Klyenovo-Chegodaevo” in the Podolsky area in the Moscow region for fattening livestock of pigs (crossbreds Landrace×Large White breeds). Two groups of animals (control and experimental) have been formed on the principle of pairs of analogs taking into account the origin of yelts, their age, and live weight at the beginning of experiment. It has been found after the control slaughter that the weight of the chilled carcass of pigs in the experimental group was signifi cantly higher and amounted to 81,93 kg against 75,59 kg in the control group (Р ≤ 0,05), which was by 6,34 kg or 8,38 % more. It has been revealed the increase in the slaughter yield in the experimental group was 0,78 abs.%. as a result of calculating the economic eff ectiveness of the results obtained that the use of organic-mineral complex Sebelmin as part of complete diet compound feed for fattened pigs allows us to get additional profi t from the sale of pork in the amount of 436,58 rubles per 1 head.

The aim of this study was to focus on poultry meat quality by studying the effect of using an energy-protein compound (EPC) based on inedible dates, mixed with synthetic amino acids (0.5% lysine and 1% methionine), and a complex of enzymes (α-amylase, β-glucanase) in broiler chicken's diets, which is a part of a larger project to determine whether this compound can be incorporated into Algerian meat production systems without having a negative effect on the overall product quality. Two groups of 50 heads broiler chickens each were used to evaluate nonconventional feed based on inedible dates (EPC) during 42 days. At the end of the experiment, EPC substitute 20% of maize without adversely affecting the rates of growth and mortality. After slaughter, the weight of the femoral muscles of the experimental birds was less than the control birds. But, the weight of the pectoral muscles was significantly higher in the experimental birds' carcasses compared to control group. Analysis of dry matter, protein, fat, and the levels of amino acids showed a significant difference. Control birds had a higher weight of skin and abdominal fat compared to experimental birds. Using energy-protein compound (EPC) based on inedible dates as an alternative for corn in broiler chicken's diets showed positive effect on meat quality, ameliorating weight and amino acids content in broiler's muscles. Thus, EPC can be used as compound to substitute 20% maize in the broiler diets, without affecting production performance.