Evaluation of the relationship between rate of the infection to hepatic trematoda and excretionof eggs in native ruminants of Behshahr

In the present study, the incidence rate of hepatic trematodes infection in slautered native ruminants of Behshahr and relationship between egg excretion and severity of the infection were evaluated. 1280 sheep, 318 goats and 420 were studied. Totally, infection to Fasciola and Dicrocoelium dendriticum were 1.4% and 4.84% in sheep, 2.2% and 3.78% in goats and 10.24% and 2.14% in cattle, respectively. Statistical analysis did not show significantly relationship between infection of hepatie Fasciola to age and sex; there was no correlation between hepatie infection to dicrocoeliasis and sex of animals.Relation corresponding age variable in sheep and goats unlike cattle was significant. No eggs isolated from sheep and goats in 44% of sheep and goats with different severity of the infection and in 56% of rest , 1 to 3 eggs per gram feaces with a maximum of infection to four worms were isolated. Statistical analysis showed that correlation between the severity of infection to Fasciola and rate of egg excretion was significant in sheep and goats, but did not show in cattle. Moreover, there was no significant relationship between severity of the infection to dicrocoeliasis and rate of egg excretion in Goats and sheep, but it was in cattle. Inspite of the most practical method to detection infection trematodes is stool exam and observation of their eggs, our finding reveal that this method may be not reliable.