Determination of the prevalence and parasite burden of Coeunurus cerebralis and Oestrus ovis in sheep in Siirt province of Türkiye

The aim of this study was to determine the prevalence and parasite burdens of Coeunurus cerebralis and Oestrus ovis in sheep in Siirt province, Türkiye. Between December 2022 and November 2023, a total of 520 sheep (260 male, 260 female) heads (10 heads per week) were randomly sampled from a butcher. The total prevalence of C. cerebralis was determined to be 12.9%. The prevalence was higher in males, in the Morkaraman breed, in animals younger than two years of age, in dark-coloured ones, in October, and in the right brain hemisphere. The total prevalence of O. ovis was determined to be 38.3%. The prevalence was higher in females, in the Akkaraman breed, in dark-coloured breeds, in age groups older than two years, and in December. In terms of larvae, L 1 was detected in 108 sheep, L 2 in 106 sheep, and L 3 in 139 sheep. A total of 1,039 larvae (278 L 1 , 321 L 2 , and 440 L 3 ) were detected. The significant presence of O. ovis found in the sheep in this study indicates that Siirt province has suitable climatic conditions for O. ovis and larval development. It is recommended to include more animals in a future study in order to determine the exact seasonal prevalence of O. ovis infestation in the region, and to use an antiparasitic drug effective against O. ovis in the routine treatment of sheep to reduce the incidence of this disease.