Histomorphological study of small intestine during one day age in local pigeon Columba livia
Author(s): Harith Hummadi Al-Mohmdi and Suhaib AH AL-Taai
Abstract: The study included 8 local pigeons Columba livia for macroscopic and microscopic findings. Ages were 24 hours after hatching. They were weight (9-10 g). Our study showed the entire small intestine, they included three loops, duodenum, jejunum and ileum. The present study expressed that the duodenum U-shape, has two arms; ventral (descending) and dorsal (ascending) loops, that loops included between them the pancreas. The shape of the small intestine characterized a white in color and a very thin wall, therefor we gently must deal during dissection. The study showed jejunum and ileum of one day age were recognized by the appearance of Meckel's diverticulum connected with yolk sac. The diverticulum is separated between the jejunum and ileum. It's located at the end jejunum. The jejunum was characterized spiral coil like, and anastomosing with upper (dorsal) part of duodenal arm and occupied almost the posterior part of body cavity. Part of jejunum and duodenum were covered by right lobe of liver. The light microscope showed the duodenal mucosa had a finger structure ofvilli. The first part of mucosa was called the epithelium, a simple columnar with oval nuclei, lined surface of villi. Lamina properia was loose connective tissue. The third layer of mucosa was muscularis. In jejunum, the upper surfaces of villi had a few distributions of the goblet cells, these cells have appeared positive reaction with Alcian blue stain. Lengths and shapes of villi were different between the three entire segments. Firstly the study recorded the absence of intestinal glands in entire the small intestine during one day age pigeon. Either crypts of Lieberkuhn were less developed or absent during the current study.