Gastrointestinal helminths of sheep breed in pomoravski and rasina district (Serbia)

The study about gastrointestinal helminthes of sheep at central parts of Šumadija region - Pomoravski and Rasina district was started in March 2016 and finished in October 2018. During our research 937 fecal samples originated from 62 sheep flocks were collected individual at monthly intervals. A total of 57 animals we were analyzed by post-mortem examination. Determination of parasites eggs we performed by keys given by Euzeby (1981). We occured next parasite species: Haemonchus contortus, Teladorsagia (Ostertagia) circumcincta, Ostertagia trifurcata, Ostertagia ostertagi, Ostertagia occidentalis, Marshallagia marshalli, Trichostrongylus axei, Trichostrongylus colubriformis, Trichostrongylus vitrinus, Nematodirus filicoliis, Nematodirus spathiger, Nematodirus abnormalis, Cooperia curticei, Cooperia oncophora, Cooperia punctata, Cooperia zurnabada, Skrjabinema ovis, Bunostomum trigonocephalum, Oesophagostomum venulosum and Chabertia ovina. Most prevalence species of nematode are Ostertagia, Trichostrongylus and Nematodirus,species. Although most of the gastro-intestinal species appear to follow this general pattern of seasonal distribution, some variations in intensively and duration of these characteristics with different worm species occurred. Thus with Trichostrongylus and Ostertagia species infection at mature goats the spring peak was more pronounced that the autumn infection. Poliparasitismus and infection were established at all examined animals. The intensity of infection and polyparasitsm was monitored in relation to the age of sheep. It was found that in younger animals intensity of infection was lower than that of older animals