ВПЛИВ МІКРОЕЛЕМЕНТІВ ТА ГУМІЛІДУ НА ВІДТВОРНУ ФУНКЦІЮ ТЕЛИЦЬ УКРАЇНСЬКОЇ М’ЯСНОЇ ПОРОДИ

The article presents research data on the impact of deficient dietary microelements (cobalt and selenium) and biologically active supplement Humilid  on the indicators of the reproductive function of heifers after the first calving. We have found out that Humilid and trace elements influence on the physiological state of reproductive organs and stimulate the sexual heat of animals. Regarding the duration of the period from calving to fertilized insemination, the difference between the control and experimental groups is more visible. Thus, the service period in the experimental group I (under the influence of Humilid) was 293.2 days, which is 2.6 days less than in the control group. In the experimental group II (under the influence of cobalt and selenium), it was, respectively, by 3.9 days less than in the control one. This may indicate that the minerals and dietary supplements contribute to more rapid recovery of the ovarian cycle. Protein composition of blood serum was investigated in the study of the biochemical spectrum of blood. Balancing the nutrition of animals with deficient dietary microelements and adding Humilid increase the concentration of protein molecules, which is visible from the indicator of crude protein and its components - albumen and globulin. In comparison with animals in the control group, a total protein level of heifers in the experimental group I was higher by 8.8% (P <0.05), and in the experimental group II - by 8.6% (P <0.05). This may indicate the increased intensity of synthetic and redox processes in heifers’ bodies in preovulatory period which serve best for the insemination. The level of albumen was also higher by 8.0 and 7.3% respectively under the influence of Humilid and trace elements in relation to the control group, indicating the improvement of transport of substances, in our case estradiol. As far as globulin is concerned, the growth of this class of proteins was marked by 9.4 and 9.6%, indicating the improvement of the level of resistance of the organism. Thus, the increase in blood biochemical parameters creates certain conditions in heifers’ body to improve their insemination.