Electron-microscopic study of enterocytes of intestinal crypts of the small intestine of a hybrid of a yak (BOS MUTUS) with a cow of a black-and-white Holstein breed

Abstract

In this work, an electron microscopic study of the structural features of enterocytes of intestinal crypts of the small intestine of hybrids obtained by crossing a yak and a cow of a black-and-white Holstein breed in comparison with the original species was carried out. The study indicated the similarity of the structure in the hybrids of all studied variants of crosses and the original species of borderless and goblet enterocytes of intestinal crypts of the duodenum and jejunum. The infinite enterocytes of the intestinal crypts of the hybrids had a well-developed smooth and granular endoplasmic reticulum, as well as many free ribosomes. The Golgi complex of crypt enterocytes in its development varied greatly, mitochondria were small, most often round in shape. Secretory granules had different electron density, more often moderate, matrix - average electron density. The cells of the Brunner glands were conical in shape with rounded apical ends, a well-developed Golgi complex, a smooth and rough endoplasmic reticulum, which formed extensive dilated lumens containing fine-grained material. The mitochondria were found to be predominantly rounded. Secretory granules completely filled the apical end of the cell and had a low electron density.