Age dynamics of hematological and biochemical parameters of bull calves in relation to technological and environmental conditions of their keeping

The work established the immunophysiological feasibility of joint application of natural bioactive substances to bulls at the beginning of the growing, rearing and fattening periods, taking into account the regional biogeochemical specificity. In this regard, a series of scientific and economic and laboratory studies were carried out on 3 groups of bulls-analogues of 10 heads each. These animals were kept from 2 to 150 days of age according to adaptive technology, and then up to 540 days (duration of experiments) - according to the industrial system. The bulls of group 1 served as a control. Animals of groups 2 and 3 were assigned respectively trepel with «Polistim» and iodomidol with selenopyran according to the developed schemes. Age variability of clinical and physiological state, hematological and biochemical profiles was determined in experimental bulls. The results showed that if the combined use of animals tested bioactive substances was characterized by almost equivalent immunotropic effect, the thyrotropic effect on the body was markedly more pronounced in the conditions of appointment of iodomidol with selenopiran than trepel with «Polistim».