Abstract
The aim of research is to study the development of structural and functional features of the reproductive system of broiler chickens using the feed additive Yantarnyj holodok. Research was conducted on broiler chickens of the Ross-308 cross under experimental conditions, while for the experiment, control and experimental groups of 30 heads each were created, starting from the day-old age, broiler chickens of the control group received tap water from vacuum drinkers without adding a feed additive, and chickens of the experimental group were given the feed additive Yantarnyj holodok daily in a dose of 1.5 l / t with drin¬king water until the end of growing. As a main diet, broiler chickens of both groups received compound feed of Ptitsefabrika Artemovskaya LLC. The use of the feed additive Yantarnyj holodok had a positive effect on the live weight gain, which by the end of the experiment was 2,938.10 ± 405.34 g, which was 1.9 % higher than the average value in the control group. 100 % survival of broiler chickens in the experimental group was established. Histological studies revealed the process of gradual improvement of the ovary structure, the formation of its cortical and cerebral zones. At the age of 10 days, the histological structure of the ovary was not formed and represented only the protein coat, and the internal part was represented by chaotically scattered follicles, among which follicles in the pertification state were found. By the 20th day, the cortical and medullar zones of the ovary could be seen. By the 35th day, the formation of egg-bearing mounds with a zone of formed follicles of varying degrees of maturity is observed, but complete maturation of follicles with a formed egg cell was not detected in the studied individuals. The medullar zone of the ovary is rich in blood vessels of different calibers, that is, the vascularization of the ovary of chickens of this age is significantly developed.
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