Thesis:

Investigating the infection with liver parasites in slaughter animals in Sabzevar city in the first half of ۲۰۲۵.

Effective control of diseases primarily requires sufficient knowledge of transmission patterns in endemic areas. This issue has become increasingly complex due to the intraspecific diversity of parasites. The present study was conducted with the aim of assessing the prevalence of hepatic parasitic infections in slaughtered livestock in Sabzevar County during the first half of 1404 (2025). In this investigation, the rate of infection with selected parasites was examined in animals slaughtered at the Sabzevar municipal abattoir over a five-month period. According to the results, out of 16,377 slaughtered animals, the distribution of slaughters across the months of Farvardin, Ordibehesht, Khordad, Tir, and Mordad was 14.82%, 15.16%, 19.25%, 18.75%, and 32.01%, respectively. The highest number of animals were slaughtered in Khordad, comprising 1,553 females and 3,684 males. The findings revealed that 6.15% of slaughtered female sheep and 0.96% of slaughtered male sheep were infected with hepatic hydatid cysts. The prevalence of hepatic hydatid cyst infection among female and male goats was 1.90% and 2.14%, respectively, while in female and male cattle, it was 7.28% and 0.98%, respectively. The prevalence of Fasciola infection in male sheep was 8.90%, and that of Dicrocoelium infection was 1.96%, representing the highest infection rates among the slaughtered animals. In Khordad, the prevalence of hepatic hydatid cysts in female and male sheep was 11.40% and 1.09%, respectively, while in Ordibehesht, it was 4.94% and 0.95%, respectively. The prevalence of Fasciola infection in female and male sheep in Khordad was 2.63% and 8.39%, respectively. Furthermore, statistical analysis demonstrated a significant association between parasitic infection rates and the sex of slaughtered animals.

Keywords: Livestock infection; Parasitic infection; Abattoir; Fasciola; Sarcocystis; Hydatidosis