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The article deals with the data on the influence of probiotic preparation BPS-44 and 2% yeast Saccharomyces cerеvisiae on the histostructure of tissues of the cloacal sac (bursa of Fabricius) of broiler chickens. The conducted histological researches have shown that in chickens of the control group at the end of the experiment in the cloacal sac were revealed intraepithelial microcystic cavities, but in the medullary substance of the lymph nodes, necrotic changes are recorded and glandular structures are formed, indicating an insufficient level of lymphopoiesis. The use of these probiotic preparations to broilers from the experimental groups during the period of their growth in the ration caused a normalizing effect on the morphostructure of the cloacal sac and, in particular, on the action of 2% yeast Saccharomyces cerеvisiae. It is evidenced by the absence of the formation of microscystic cavities in the epithelial layer of the cloacal sac (signs of slowing down the processes of age involution). In this case, the lymph nodes are numerical, the division into cortical and medullar substance is clear, they were densely populated with lymphoid elements, indicating the possibility of forming an adequate immune response in the poultry of this group.

Influence of probiotics on histostructure of the bursa of Fabricius in broiler chickens