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Oestrus ovis larval myiasis among sheep and goats in Central Oromia, Ethiopia

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Abstract

A study was conducted to determine the prevalence, larval burden, and associated gross pathological lesions of Oestrus ovis in sheep and goats slaughtered at Luna export abattoir in Central Oromia from November 2007 to March 2008. For this purpose, a total of heads of 431 goats and 369 sheep were thoroughly examined for the presence of first (L1), second (L2), and third (L3) larval stages according to standard procedures. O. ovis larvae were detected in 349(94.6%) sheep and 381(88.4%) goats. All three larval instars were observed in each study months. Statistically significant variation (χ 2 = 29.2676, df = 6, P < 0.05) was observed in the prevalence of O. ovis among small ruminants of different origins. Likewise, statistically significant (χ 2 = 68.3, df = 4, P < 0.05) difference was recorded in the prevalence of O. ovis in sheep and goats among different study months. The overall monthly prevalence ranged from 77.7% in November to 98.8% in March. The prevalence of O. ovis in small ruminants of less than 1 year of age was significantly (χ 2 = 8, df = 1, P < 0.05) higher than those with greater than 1 year of age. An overall proportion of 33.8%, 40.1%, and 26.1% were recorded for L1, L2 and L3, respectively. Whereas 6.8 monthly mean larval burden per individual infested animal was noticed. Out of the total infested heads in goats, 33.6% had catarrhal discharges, 16.8% purulent exudates, 64.83% rhinitis, 68.77% sinusitis, 14.2% pharyngitis, and 9.2% bloody exudates. Similarly, of the total infested heads of sheep, 18.9% purulent exudates, 80.8% rhinitis, 71.9% sinusitis, 13.5% pharyngitis, and 7.7% bloody exudates gross lesions were recorded.

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Acknowledgements

The authors are indebted to the owner and officers of Luna export abattoir in Modjo town for their very kind help in the achievement of this study.

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Authors and Affiliations

  1. School of Veterinary Medicine, College of Agriculture and Veterinary Medicine, Jimma University, Jimma, Ethiopia

    Fana Alem & Hailu Degefu

  2. Department of Parasitology and Pathology, Faculty of Veterinary Medicine, Addis Ababa University, P.O. Box 34, Debre Zeit, Ethiopia

    Bersissa Kumsa

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  1. Fana Alem
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  2. Bersissa Kumsa
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  3. Hailu Degefu
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Correspondence to Bersissa Kumsa.

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Alem, F., Kumsa, B. & Degefu, H. Oestrus ovis larval myiasis among sheep and goats in Central Oromia, Ethiopia. Trop Anim Health Prod 42, 697–703 (2010). https://doi.org/10.1007/s11250-009-9477-6

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