Morphogenesis of some organs of the immune system of broiler chickens in the age aspect when adding the feed additive 'Amber Chill feed supplement' to the diet

This article uses the results of a comparative morphological study of Ross 308 cross broiler chickens of the experimental and control groups when introducing the feed additive “Amber Chill feed supplement” with drinking water during the technological cycle. The experiments were conducted at the Ural Federal Agrarian Research Center Ural Branch of the Russian Academy of Sciences” in 2023. The inclusion of the feed additive “Amber Chill feed supplement” in the diet of broiler chickens did not have a negative effect on the general condition, safety of poultry, and live weight gain. The hematological parameters of broiler chickens of the control and experimental groups were within the reference values. Histological examination of the organs of the immune system – thymus, spleen, bursa of Fabricius at 10, 20, 35 and 42 days of age revealed the processes of maturation and differentiation of organs and some processes of involution by the end of the technological cycle. A distinctive feature between the groups was the earlier maturation of the immune system organs in broiler chickens of the experimental group, as opposed to the control group.