prevalence of fasciola hepatica in slaughtered livestock in yasuj's slaughterhouse 1381-1382

introduction & objective: protein is one of the important nutritional groups of which the main source is domesticated animals. parasitic infection of these livestock is a threat to the meat resources as well as trouble to health of the user. so, the infection rate for zoon sis in each region can be an indicator for the health of the people living in that region. concerning the geographical situation of yasuj , tribal life and animal husbandry in this region, there is the probability of prevalence of zoon sis. thus the present study has been done in order to investigate the infection rates of slaughtered domestic animals in yasuj industrial slaughterhouse. materials & methods: this study was carried out descriptively and prospectively concerning the slaughter chart of the years 1380 and 1381 available in yasuj industrial slaughterhouse and the veterinary office of the kohgiloyeh and boyerahmad province. the information present in the charts were transferred to the tables designed according to desired variables such as the kind and the number of the slaughtered domestic animals, the kind of the parasite, the number of the infected domestic animals, month, season and the year. these information were analyzed statistically. results: in this paper, the prevalence of fasciola hepatica was investigated and it was concluded that 27490 (14.4%) domesticated animals out of the total number 190861 slaughtered domestic animals including sheep, goats and cattle has been infected by this parasite. infection rate was (9.26%) . in general, the highest prevalence rate was in the winter. the prevalence rate of infection in sheep (17.71%) was higher than the one in cattle (16.71%) and in goats (11.69%). conclusion: the infection rate for zoon sis is considerable in yasuj. so the separation of the infected domestic animals, the omission of these infected bodies from the nutritional material production cycle as well as the cure of the infected domestic animals can play an important role in improving the public health. these infections were mostly in winter and it is thought that, concerning the life cycle of parasites, these infections are because of the contamination of animals in spring and summer