Assessment of influence of ultrafine particles of Cr<sub>2</sub>O<sub>3 </sub>on metabolic processes in the body of calves raised on protein diets
Chromium in ultradispersed form, possessing high biological activity, is an activator of metabolic processes in the body. However, the issues of the safety of using ultradispersed chromium particles in animal feeding and their effect on metabolic processes in a living organism are still open. Therefore, the purpose of our study is to assess the effect of ultrafine particles of Cr<sub>2</sub>O<sub>3</sub> on the morphological and biochemical parameters of the blood of calves raised on protein diets. The studies were carried out on 9-month Kazakh white-headed bulls with a live weight of 200-220 kg. The animals of the control group received basic diet (BD), protein components were additionally included in the diets of animals of the experimental groups: calves of groups I and II - sunflower cake, and III and IV - soybean meal. Cr<sub>2</sub>O<sub>3</sub> in ultrafine form (d = 91nm) was administered to calves of groups II and IV when feeding protein rations daily at a dosage of 200 mg/bird/day plus 10%, taking losses into account. Based on the results obtained in the course of work, it was noted that when ultrafine particles (UFP) of Cr<sub>2</sub>O<sub>3</sub> are introduced into the diets of calves, a change in morphological and biochemical parameters of the blood is observed, it is reflected in the stimulation of protein metabolism in the body - an increase in the level of total protein and albumin in the blood serum. UFPs of chromium oxide take an active part in lipid metabolism, the level of cholesterol in the blood significantly decreases in the experimental groups by 41.6-50.2%.