comparative histomorphometrical study of genital tract in adult laying hen and duck

this study was carried out to compare the histomorphological structures of oviductal regionsof the apparently healthy adult laying hens (gallus gallus dometicus) and ducks (ansa ansadomesticus). for this purpose, 20 hens and 20 female ducks aged between 1–1.5 years were used.after euthanasia, the oviducts were dissected out and all of the gross morphometrical parametersincluding length, width and thickness as well as weight and length of them were recorded. forhistological studies, after tissue preparation and staining with h&amp;e, histological layers of isthmus,uterus and vagina were recognized and the size of them with micrometry method weredetermined. our data analyses indicated that, the mean weight, length of oviduct as well asweight of isthmus, uterus in hen were significantly (p < 0.05) greater than that of duck, whereasthe vaginal thickness and weight were greater in duck than the hen. in histological studies,epithelium and cilia were well developed in duck and lamina propria was filled with glands in theregions of the isthmus and uterus. the length of primary mucosal folds of isthmus and uterus induck was more than hen. the longest mucosal fold has been seen in uterus. most of theparameters in duck were greater than hen except the length of secondary fold of three parts ofoviduct including isthmus, uterus, and vagina.