Regularities of morphological rearrangement of the rabbits’ thyroid gland in the postnatal period ontogenesis

Abstract

The study of the morphology of thyroid gland in rabbits during age periods is of both theoretical and practical importance. In this work, the age dynamics of the development of rabbit thyroid glandJ was studied. The topic of research is very relevant, since the endocrine system is closely connected with other, important processes taking place in other organs and tissues associated with the correct activity of the body. The object of the study was rabbits, the subject of the study - thyroid glands. When performing histological studies of thyroid glands in postnatal ontogenesis, the following parameters were determined: capsule thickness, interlay er thickness, thyrocyte heights, the volume of their nuclei, the size of C cells, the diameter of follicles and their percentage ratio in the gland. Research was carried out in the conditions of the rabbit-breeding farm of the Vitebsk region of the Republic of Belarus, the prosector and laboratory of the Department of Pathological Anatomy and Histology of the Vitebsk Order of the Badge of Honor of the State Academy of Veterinary Medicine. Studies have found that the most significant growth and development of the gland occurs during the weaning period (one month) and then during puberty (four to six months). Then, from the age of 6 months, structural adjustment processes characterized by regression processes develop. Thus, it can be seen that by 5-6 months of age, the thyroid gland has its completed structural structure, then from 6 months to 8 months of age structural regression processes develop. Thus, the results of the studies will deepen, expand and supplement the data on the age and comparative morphology of fur animals and can be a criterion for their assessment in practical veterinary medicine and in rabbit breeding in general.