Histomorphological study of the duodenum in swan goose (Anser cygnoides)

Abstract

The current study aimed to observe the morphological, and histological features of the small intestine (duodenum) in adult male and female swan geese. The study was carried out on 10 adult geese, with ages ranging from(one-two) years. These birds were used for morphological and histological study. The birds were weighed, then euthanized by injection of Ketamine and xylazine intramuscularly in the pectoral muscle. The coelomic cavity was dissected and photographed to identify the intestinal morphology and the location of organs. Duodenum were grossly described and measured (weight, relative weight, length, relative length, and diameter, relative diameter, and volume, relative volume). Histologically, the specimens were fixed in 10% neutral buffered formalin for histological study. The sections were stained using a (Hematoxylin-Eosin) and PAS stain. The morphological study showed that the small intestine is composed of three segments (duodenum, jejunum, and ileum). The duodenum formed from a U-shaped tube occupies the pancreas, and the ileum appeared shorter part of the small intestine, the mucous membrane of the small intestine showed a clear velvet-like appearance by long finger-like shaped villi, different in size and shape. Conclusion: The duodenum formed a U-shaped tube occupying the pancreas, the mucous membrane of the small intestine showed a clear velvet-like appearance by long finger-like shaped villi, different in size and shape to increase the surface area of absorption. The mucosal glands different in size and shape occupied most of the lamina propria. The goblet cells showed high density toward the end of the intestine. The duodenum showed the largest surface area of villi than other organs of the digestive tract.