Prevalence and Morphometric Comparison of Trichostrongylus spp. among Sheep and Goats from Kashan Abattoir, Central Iran

length, were measured in 70 worm isolates. The data were analyzed using the ANOVA test in SPSS 18 software. Results: Of 284 livestock (130 goats and 154 sheep) examined, 26 (9/15%) were infected with Trichostrongylus. The prevalence of infection in goats and sheep was 12.3% and 6.5%, respectively. The most frequent species were Trichostrongylus colubriformis (48.7%), followed by Trichostrongylus vitrinus (25.7%). Trichostrongylus capricula and Trichostrongylus probolurus had an incidence of 12.8%. T. probolurus showed a higher length of spicule and gubernaculum, while T. vitrinus showed a wider copulatory bursa compared to the other species ( P <0.001). Conclusion: The prevalence of Trichostrongylus infection in this region was remarkable. Morphometric and morphological methods are practical tools in differentiating