Histoarchitectonics of the Harderian gland of chickens in the post-vaccination period

Understanding the effect of vaccination on body chickens is impossible without exploring morphology immune defence organs. The purpose study was to identify morphological changes in Harderian gland Haysex Brown aged 1, 15, 25, 50, 75, 100 and 120 days under influence vaccination. following methods were used study: anatomical, histological, light-optical, morphometric, statistical. Histological preparations different ages (1, days) vaccinated unvaccinated groups analysed. features organ structure, its lymphoid structures their types forms explored histological chicken gland. According studies, it established that this a complex tubular lobular gland, which consists secretory lobules with ducts. interlobular connective tissue contains significant number lymphocytes, plasma cells, other cells. In at 25 age, presence diffuse noted, not observed control group, 50 age - development nodular form tissue, maximum age. 100, experimental amount increased, noted lobules. It has been proven as peripheral defence, developed both groups. poultry an important tool for preventive protocols modern farming. results should be considered when improving technology rearing exploitation ensure high vitality and, accordingly, productivity