The article presents the results of using the SmaXtec internal monitoring system for fattening calmyk calves up to 18 months with the inclusion of local natural feed additives in the diet. For 60 days of fattening, an absolute increase in live weight was obtained from 45 to 55 kg with an average daily increase of 800-900 grams. We studied the monitoring data – the pH level and temperature of the rumen, the activity of the animal during the fattening period when changing the feeding diet. Calculated the costs and cost of feed during fattening.

The results of scientifi c and production experiment in fattening of steers of Kalmyk breed under farm environments of feeding have been presented in the article. The ration of the experimental group of steers included local natural mineral feed additives: Khongurinsky zeolite and Kempendyskaya salt, the deposit of them is located in the Suntarsky district in the Republic of Sakha (Yakutia). It has been found when adding 200 g/head/day of zeolite and 45 g of salt to the ration for fattening steers the growth of young animals has increased by 12,0 % compared to the control group. The research has confi rmed the prospects of using local natural mineral feed additives in the ration of fattening steers in order to increase the growth and development of animals. In a short period of fattening after feeding (for 60 days), you can get an absolute gain in live weight from 40 to 50 kg with an average daily gain of 700–800 g with a daily feed consumption of 8 to 9 EFU with the fi nal live weight of 350 to 400 kg at the age of 18 months in farm environments of feeding. The feed conversion rate was 9,77. The level of profi tability from rearing of steers of Kalmyk breed by the age of 18 months has increased in comparison with the 15-month age, and in all age periods young Kalmyk cattle were more profi table than their herdmates of other local zoned breeds. For example, the superiority at 15 months of age was 8,2–3,5 %, at 18 months – 11,7–3,4 %. Economic calculations have shown that the prime-cost of 1 kg of meat at slaughter is 143,34 rubles, profi t per 1 ruble of costs – 2,14 rubles, profi tability – 186,13 %. Higher profi ts and profi tability obtained in the sale of the Kalmyk steers. Rational use of fattening-off and organization of fattening of steers leads to minimizing the prime-cost and increasing the effi ciency of beef cattle breeding in Yakutia.

Obtaining high results in the production of highquality beef in beef cattle breeding is impossible without well-organized fattening of gobies. In the conditions of Yakutia, fattening of gobies from 15 months of age can be carried out in autumn, after the summer grazing feeding. Under economic conditions of feeding, high growth rates of fattening young animals cannot be obtained. Therefore, intensive fattening with the use of mineral feeding of cattle is used. The paper presents research materials on the morphological and biochemical composition of blood and its serum in calves of the Kalmyk breed, which are on scientific and industrial fattening. In the experimental group of animals, local natural feed additives – zeolite and salt – were added to the diet, which served as adaptogens and sources of mineral elements. During the feeding period before the slaughter, the morphological composition of blood in terms of indicators has insignificant decreases, but within the physiological norm. We see these changes in the gobies of the experimental control group and associate them with a sharp decrease in atmospheric air temperature to –15 °C in the first ten days of November 2019 and a constant transition to roughage. It is also possible that the use of natural feed additives in the form of feeding zeolite and salt increases metabolic processes in the animal's body. A comparative analysis of biochemical parameters in the blood serum of gobies of the experimental group confirmed significant differences in hepatic enzymes (ALT and AST) in animals. The use of non-traditional natural feed additives with the inclusion in the diet of fattening gobies affects the hematological and biochemical parameters of blood and its serum, and, accordingly, meat quality.

The work includes research using the SmaXtec internal monitoring system for Kalmyk bulls fattening in the conditions of Yakutia. The indicators of the rumen pH-value, rumen temperature and animal physical activity were analyzed. The data of bulls health state weekly monitoring via bolus-sensors and natural and climatic factors in the fattening period are presented. We studied the Kalmyk bulls monitoring daily indicators (15–18 months) using the SmaXtec system. Digital technologies were used and remote information sourcing from farm livestock in real time mode was obtained for the first time in the region’s cattle breeding.

The article presents the study results of the Kalmyk breed bulls meat chemical composition, that had been fed local non-traditional feed additives — zeolite and salt. The data shows differences in chemical composition of the average sample bulls meat, in the experimental group dry matter was from 27.09 to 31.02%, meat protein was 2.97% higher, and fat was 2.18% higher than the control group. The ratio of protein and fat in both group meat was 0.62-0.64. In studied meat samples was different vitamin content. In the experimental animals meat, B1 vitamin was 26.8% higher, B2 -5.9%, E - 2.6%, PP - 8.2%. Studies show that the mineral additives in the diet contributes to a greater accumulation of dry matter, nutrients, and vitamins. Under such technology, beef has a great energy density and biological value. The article also reflects the study results of the Kalmyk bulls meat macro- and microelement composition. When analyzing the data, we found that the animals receiving natural feed additives have the best ultimate composition in their meat.