MATERIALS AND METHODS
The digestive tract and the associated glands were collected from sheep autopsied at the slaughter houses at Mymensingh town and the BAU campus. The study was carried out at the Department of Parasitology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh where different organs were thoroughly examined for the detection, collection and morphological studies on the helminthes from January to December 2004. Although there are six seasons in Bangladesh but only three seasons are prominent such as summer (March-June), rainy (July-October) and winter (November-February). So, the experimental period was divided into these three seasons for the convenience of the study.