Comparative Study of Histometric Oesophagus Layers in Iraq black patridge ( Francolinus francolins) and White breasted kingfisher (Halcyon smyrnensis)

Abstract

The present study aimed to investigate the relation between the histological structure of the oesophagus and feeding habits in Iraqi black partridge (Ibp) Francolinus francolins and white breasted kingfisher (Wbk) Halcyon smyrnernsis through measurement of oesophagus layers and compared with both birds. The results showed that the mean thickness of tunica mucosa was significantly great in anterior part ( cervical) oesophagus of (Ibp) as compared to (Wbk). While the mean thickness of both tunica muscularis and adventitia were significantly greater in (Wbk) as compared to (Ibp) p<0.05. The mean thickness of tunica mucosa was significantly greater in median part (crop) of oesophagus in (Ibp) as compared to (Wbk) p<0.05. The mean thickness of tunica mucosa was significantly greater in posterior part (thoracic) of oesophagus in (Ibp) as compared to (Wbk) p<0.05.