author(s)
Anil Deka

abstract
The magnum was the longest and most coiled part of the oviduct. It was located just ventral to the left kidney in both the varieties. The length, breath, thickness and weight of magnum is significantly higher (P<0.01) in Chara-Chemballi duck than Pati duck. Histologically, the lamina epithelialis mucosa of the magnum was lined by pseudo stratified ciliated columnar epithelium in both Patiand Chara-Chemballi ducks. Primary, secondary and tertiary mucosal folds were observed in magnum, but the tertiary folds were less in magnum than the other parts of oviduct in both the varieties. The lamina propria sub-mucosa of magnum contained tubular glands. Tunica muscularis of magnum consisted of inner circular and outer longitudinal smooth muscle fibers. Tunica serosa of magnum consisted of loose connective tissue in both the varieties. The connective tissue fibers and nerve fibers were also present in the magnum of both Pati and Chara-Chemballi duck. The height of lamina epithelialis mucosae of oviduct was significantly higher (P<0.01) in Chara-Chemballi ducks than Pati ducks. In scanning electron microscopy, the secondary folds of magnum were more complex and tortuous and more number of glandular openings in Pati duck whereas in Chara-Chemballi duck, these folds were simple and less number of glandular openings were observed. It might be therefore concluded from the above study that the Chara-Chemballi duck revealed relatively significant difference in most of the parameters than the Pati ducks except in scanning electron microscopy.