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OJVRTM
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
ABSTRACT
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.
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