The paper presents the results of a study on the effect of probiotic feed additive “Amilotsin” on the productivity of pregnant ewes and castrate rams. The ewes who received the optimal level of Probiotic feed additive (PFA) “Amilotsin” in the diet throughout the entire experiment were significantly superior in their live weight to their analogues. Animals of the second group at the end of the experiment had a live weight higher by 3.4% than in the first and by 2.4% compared to the third group. The highest average daily gains during the study period were in ewes of the second group, then in animals of the third group. Castrate rams of the first experimental group treated with the composition of the basic diet of the feed additive “Amilotsin” in the amount of 0.38 and 0.19 g/kg of live weight per day during the entire experimental period had an average and absolute live weight higher than the control group, the second and the third experimental groups.
The aim of the study is to analyze the commodity properties of sheepskin and the histostructure of the skin of rams of Kalmyk fat tail breed and crossbreeds (1/2 Kalmyk fat tail × 1/2 Dorper). The uterus of group I was covered with sheep of the Kalmyk fat tail breed, and the ewes of group II with sheep of the Dorper breed (experimental group). The study revealed, the mass of paired sheepskins of young group I was greater than that of peers of group II by 1.0 kg or 34.5 % (P> 0.999). A large live weight affected the large area of the skin of the second group of young animals, and the length of the hair of the experimental group, which turned out to be shorter, affected the smaller weight of the sheepskin. Pets have the best quality indicators of sheepskin and the best histological structure of the skin. Cross-breed animals have 14.52 % of more elastic, stronger and less thick skin, due to a greater epidermis thickness of 27.7 % and a denser reticular layer of 13.7 %. Wool cover (the ratio of primary follicle on the secondary) in cross-breeding sheep is 10.47 % thicker, compared to peers of white color, which corresponds to the technological requirements for the production of high-quality sheepskins.
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.
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