The specialities structure-functional organization the immune formation of crop in hens of age 1, 2 and 3 years
The immune formations in non-glandular part of crop is represented only by diffuse lymphoid tissue, and in his glandular part still lonely prenodules, primary and secondary lymphoid nodules in one-, two- and three- year-old hens. The lymphoid tissue area and size their nodules in glandular part of crop decreases with the increasing of age.