Morphological study of the kidneys and the oviduct protein part in Anseriformes

The purpose of research is to study the features of the macro- and microscopic structure of the kidneys and the protein section in Peking duck and Italian goose. The object of the study is the carcasses of adult poultry. In the studied species of birds, the presence of paired dark brown kidneys located in the renal fossae of the pelvic bone retroperitoneally is noted. The kidneys consist of cranial, middle and caudal lobes, with microscopy of which the cortical and cerebral zones are noted. The relative weight of the kidneys to body weight is 0.36 % (Peking duck) and 0.29 % (Italian goose). In the studied species of birds, the protein section represents the longest part of the oviduct, forming 5-6 bends along its entire length, making up the cranial, middle, and caudal parts. The folds have different shapes and linear indicators. The mucous membrane of the protein section is covered with multi-row ciliated epithelium with the presence of goblet, ciliated and argyrophilic cells. A well-developed muscular coat is represented by longitudinal and circular layers of smooth muscle fibers. The serous membrane is covered on the outside with a layer of mesothelial cells that lie in loose fibrous connective tissue. In relation to the wall thickness of the protein section, the mucous membrane occupies from 65.1 to 68.1 %, the muscular one - from 21.5 to 25.3 % and the outer one - from 9.6 to 10.4 %. In the folds of the mucous membrane at the base of the lamina propria there are dense collagen and thin loose elastic fibers resembling a grid structure with the presence of epithelial and glandular cells that are part of the tubular glands.