Peculiarities of exchange of some trace elements in heifers after feeding them with a complex mineral and vitamin feed additive
The work was performed in 2019-2020 on heifers of Black Spotted breed in the conditions of the LLC Breeding Plant "Valieva" of the Dyurtyulinsky district of the Republic of Bashkortostan in order to study the effect of a complex mineral and vitamin feed additive (hereinafter-CMVFA) on digestibility, in particular on the exchange of trace elements. The animals of the control group received the basic diet (BD) adopted by the farm with the addition of separate mineral fertilizing (table salt and feed chalk); I group- BD + CMVFA 100 g/head per day, II group-BD + CMVFA 110 g/head per day. It was found that the use of tested feed additives in the feeding of heifers in the experimental groups contributed to a positive balance of the main controlled trace elements in the body: 1 kg of the dry matter of the diet in the manganese group there was 31.2 mg, which provided a positive balance in the body of heifers in the last period of pregnancy, in the I experimental group - 33.98 mg, and in the animals of the II experimental group, respectively - 36.7 mg; copper accounted for 4.38 mg, in I - 5.61 and in II-5.74 mg; per 1 kg of the dry matter of the diet I had 40-50. 2 mg of zinc; respectively, for cobalt-K-3.66 mg, I -5.34 and II - 5.76 mg of cobalt or more by 5.85 and 7.0% (P≤0.05). Therefore, the effectiveness of using cobalt in the body of animals depends on the presence of copper, calcium and other nutrients in the diet. At the same time, the obtained data corresponded to physiological standards. Thus, the use of CMVFA at a dose of 110 g per head per day in the diets of heifers turned out to be more effective than the use of individual mineral supplements.