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Volume: 8 Issue: 5
||Comparative Histological Studies on the Stomach of Two Avian Species (Lonchura oryzivora and Upupa epops)
Comparative Histological Studies on the Stomach of Two Avian Species (Lonchura oryzivora and Upupa epops)
Java Sparrow (Lonchura oryzivora) and Hoopoe (Upupa epops) were different avian species in their lifestyle. Java Sparrow feeds on seeds particularly rice whereas Hoopoe feeds on insects. The present investigation was designed to characterize the histological construction of the stomach in the two species. Seven Java Sparrows and seven Hoopoes were carefully dissected. The stomach was separated from each bird and fixed in 10% buffered formalin. Several procedures were done to prepare the histological sections and stained with different stains to illustrate the stomach structure by using light microscope. The stomach of the two species was constructed from two parts; periventricular and ventricular (glandular and muscular). The wall of each part in the two species was histologically characterized by four layers; serosal l. (the outermost layer), muscularis l., submucosal l. and mucosal l. (the innermost one). Submucosal layer was characterized by greenish color with Masson’s stain due to its contents of connective tissue. In proventricular part of the stomach, the submoucosal layer was occupied with deep glands. These deep glands consisted of circular lobules in Lonchura oryzivora and oval lobules in Upupa epops. These glands contained neutral "mucopolysaccharides" in the two species. Also, many superficial glands were composed of compound tubules. The mucosal secretions were acid and neutral "mucopolysaccharides in Lonchura oryzivora whereas they were acid "mucopolysaccharides" in Upupa epops. In the two species, the mucosal layer of ventriculus were characterized by tubular glands with mixture of acid and neutral muco-secretions. Keratinous layer was observed in the lining of the ventricular part and termed as cutica gastrica. The thickness of cutica gastrica in Lonchura oryzivora was greater than that in Upupa epops. The observed results in this work were indicated that the nature of the bird's living and the type of its feeding may lead to some differences in the histological structure of its stomach.