Prevalence of dicrocoeliosis in sheep and goats in Himachal Pradesh, India.

A survey incorporating field and abattoir studies was carried out on the prevalence of Dicrocoelium dendriticum in sheep and goats in the Kangra valley of Himachal Pradesh (India). Coprological studies on these migratory animals revealed that 8.1% of sheep and 4.1% of goats were positive for dicrocoeliosis, with a mean number of eggs per gram of faeces (EPG) of 702.1 for sheep and 566.7 for goats. The necropsy liver examination of slaughtered animals revealed that 24.1% of sheep and 12.3% of goats were infected with D. dendriticum and they had mean fluke burdens of 247.2 (sheep) and 298.1 (goats). No significant differences in fluke burden, liver lesion score and EPG count were observed between sheep and goats. The seasonal distribution of dicrocoeliosis indicated a higher percentage of infection in autumn and winter as compared with spring and summer. The potential role of migratory sheep and goats in the epizootiology of dicrocoeliosis is discussed.