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The study aimed to find out the histomorphological and histochemical structures of the walls of the stomach parts in mallard. To conduct this investigation, twelve healthy birds were collected from local suppliers at Baghdad province. Later on, birds were subdivided into three equal subdivisions, each of four for gross, histological and histochemical approaches. All birds were anesthetized and their abdomens were dissected, then their stomach were identified and photographed in situ. Organs were grossly described and specimens were immersed either in 10% neutral buffered formalin or in Bouin's solution for histological fixation and then processed for histological and histochemical staining techniques, which were comprised Hematoxylin-eosin, Masson Trichrome, Periodic Acid Schiff (PAS) and PAS-Alcian Blue (AB) (pH 2.5). The gross findings showed that the stomach was consisted of two distinguishable chambers, that were proventriculus and ventriculus. The proventriculus was tubular-shaped organ. The ventriculus appeared fusiform in shape and covered by thin fatty tissue. There was well demarcation between proventriculus and ventriculus. Histologically, the proventriculus mucosa lining was simple columnar epithelium. The submucosal consists of numerous and voluminous deep submucosal glands. The covering of the ventriculus was simple cuboidal. Presence of thick cuticle layer with well-developed muscular stomach. Muscularis mucosa appeared characteristically thick layer of smooth muscle bundles arranged as, inner circular and outer longitudinal layers. The tunica muscularis appeared, as a very thick structure of smooth muscles fibers. Three layers of muscles were distinguished that were thin inner, outer longitudinal and very thick intermediate circular layers.

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This project was carried out to find out the structural histomorphological changes that take place in the pelvic parts (vagina and vestibule) of the female reproductive system of the rabbits (Oryctolagus Cuniculus) at three different postnatal periods of their life that were kitten, immature and mature does. To conduct such project, twenty four female rabbits were bought (8 for each age) from the local breeders. Rabbits were euthanized, dissected and subsequently vaginae and vestibules were collected and fixed with 10% neutral buffered formalin then subjected to routine processing, such as dehydration, clearing, embedding and block preparation. Finally, sectioning for 6 µm were prepared and stained with hematoxylin-eosin and Masson's trichrome stains. Gross findings revealed that the vagina and vestibule in the local rabbits were characteristically very long tube-like structures. The vagina entirely was running ventral to the rectum together with vestibule in the pelvic cavity. Microscopic findings revealed prominent structural changes in the vagina of immature does compared to those of kittens and mature does indicated that immature does after the period of weaning face great developmental growth and changes. The microscopic changes in the vestibule were slight alterations and no age related changes were recorded. Statistical analysis revealed that the total thickness of the mucosa plus muscularis of the vaginal wall was decreased significantly in the direction cranio-caudally.In conclusion, the current study recorded differences in both macroscopic and microscopic aspects of the vagina and vestibule of the local rabbits compared to other animal species.