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Online Journal of Veterinary Research©

 Volume 22 (12): 1152-1167, 2018.

Epidemiology of trichostrongylid infestations in sheep in Pakistan


Muhammad Lateefa DVM PhD, Zafar Iqbalb*DVM PhD, Abdul Jabbarb DVM MSc, Muhammad Nisar Khanb DVM PhD.


aVeterinary  Research Institute, Ghazi Road, Lahore, bDepartment of Veterinary Parasitology, University of Agriculture, Faisalabad–38040, Pakistan




Lateefa M, Iqbalb Z, Jabbarb A, Khanb MN., Epidemiology of trichostrongylidae infestations in sheep in Pakistan, Onl J Vet Res., 22 (12):1152-1167, 2018. Epidemiology of Trichostrongylid nematodes infecting gastrointestinal tract of sheep in an agro–ecological zone of Punjab, Pakistan is described. We found H. contortus in 61.5% T. axei in 32.7%, T. colubriformis 13.4% O. circumcincta 26.0%, O. trifurcata 7.0% and C. curticei in 18.5% of 960 gastrointestinal tracts of slaughtered sheep. Most (94.6%) harbored more than one species of trichostrongylidae with a minimum of 2 and maximum of 3 in each sheep. The most frequent (46.8%) combination was H. contortus, Trichostrongylus spp and Ostertagia spp followed by H. contortus and C. curticei in 23.6%, H. contortus and Trichostrongylus spp in 19.2% and H. contortus, Ostertagia spp and Cooperia spp  in 5%. Prevalence declined with age 1, 1-2 and >2 years being 69.2, 60.7 and 46.6% for H. contortus; 50.8, 46.3 and 35.4% for Trichostrongylus spp; 37.3, 36 and 21.1% for Ostertagia spp and 18.4, 19.1 and 17.4% for C. curticei, respectively. Highest prevalence occurred during July, August and September mainly in young and female sheep. Infestation correlated with worm burden, arrested larvae, availability of nematode larvae on pasture and pre-parturient period. The results warrant development of a strategic worm control program in the area of study.


KEYWORDS: Prevalence, Larval Pasture Count, Worm Burden, Trichostrongylid Nematodes, Sheep.