HISTOMORPHOLOGICAL DEVELOPMENTAL STUDY OF DUODENUM IN LOCAL AWASSI SHEEP FETUSES(OVIS ARIS): PRENATAL STUDY

The present work was designed to investigate the characteristic features of anatomical and histological development of the duodenum in prenatal stages of local domestic Iraqi awassi sheep (ovis aris). The study was carried out at college of veterinary medicine / Al-qassim green University to study of anatomical and histomorphological changes of duodenum at different stages of intrauterine. The study was performed on health female's pregnant sheep where collected 10 sheep's fetuses distributed into two stages: 50-55days of gestational age as first trimester and 70-75 days of gestational as second trimester (five fetuses for each age). At 50-55 day of gestational age, duodenum was elongated tube with translucent wall and whitish in color extended abomasum reach to jejunum . Histologically, its wall composed of four layers: epithelium, pluripotential blastemic tissue, primordiam tunica mascularis and serosa while at 70-75 days of gestational age, anatomically, the duodenum was elongated tube, whitish in color and extended from abomasum to jejunum at midline abdominal cavity and histologically, its wall composed of four layer: epithelium, lamina propria + submucosa, tunica muscularis and serosa.