DEVELOPMENT AND GROWTH OF HEN EMBRYOS WHEN EXPERIENCING HEAT STRESS AND ADDITIONAL IODINE TRANSOVARIAL FEEDING

Abstract

The research specifies the fact that long-term heat effect on hen embryos in the period of brooding results in their stress. This is proved by means of high rate of lipid peroxidation and low blood antioxidative activity of birds aged 1 day. The authors outline negative influence of long heating in the period of brooding can be fixed by means of double egg covering with iodine specimen (before brooding and on 19 day). The research shows cardiovascular system of hen embryos of 4 brooding day in the experimental group is developed in a better way than that of the control group; major diameter of vascular area is bigger on 20.8 % and minor diameter of vascular area is bigger on 22.9 % in comparison with the control group. The authors observe length increasing and liveweight in the experimental group on 8, 12 and 16 day of brooding. The experimental results demonstrate the specimen contributes to antioxidative capacity of embryo by means of thyroid genesis; this contributed to hen embryos growth and rearing. The paper indicates different content of thyrotrophin and thyroid hormone in the control and experimental groups certifies the specimen influences efficiently on thyroid body; high characteristics of 1 day aged fish body weight and body length of the experimental group certify high physiological capacity of the young fish. The authors declare higher rectal temperature confirms chickens’ physiological maturity; it correlates the rate of thyroid hormones.