We studied the exchange of manganese in the body of lactating ewes of the Kalmyk breed. It was found out that during lactation, the intensity of metabolism of this element in the body of ewes of the meat-feeding direction of productivity significantly increases. The factorial method, taking into account endogenous losses, determined the daily requirement of fat-tailed ewes in manganese.
The article presents the results of the use of humic acids in the cultivation of Lena sturgeon in closed water supply installations. The use of "Reasil ® Humic Health" at a concentration of 1.5 g per 1.0 kg of mixed feed in fish feeding contributed to an increase in the productivity of Lena sturgeon by 6 %. Humic acids have a wide range of biological activity, affecting the metabolic processes in the body of animals and humans. The introduction of humic acids into the diet of sturgeon helps to increase productivity, due to the ability to stimulate the production of enzymes, reduces feed costs by 1 kg of growth. The use of Reasil ® Humic Health feed additive based on unmodified microporous humic acids from Leonardite in the diet of sturgeon contributes to an increase in profitability by 9.4 %.
In the arid zone of the Republic of Kalmykia, based on a detailed study of the cobalt content in organs and tissues, the degree of use of this element from diets, and taking into account endogenous losses, the norm of the need for single ewes of the meat-bearing direction of productivity in cobalt is calculated. It was established that cobalt from the diets of single ewes of the meat-bearing direction of productivity of the Kalmyk fat tail breed is assimilated by 56.14%. Given this circumstance, they should receive 0.80 mg of this element in the daily diet. Based on 1 kg of dry matter of the diet, the need for cobalt is -0.50 mg, and calculated per 1 kg of live weight, 0.01 mg.
In the physiological experience carried out in the conditions of the peasant farm of the Republic of Kalmykia, the influence of different levels of zinc in the diet, the use of calcium, phosphorus and sulfur diet of pregnant ewes of meat-sucking productivity direction has been studied.
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