Trop Anim Health Prod. 2009 Nov 1. [Epub ahead of print]
Oestrus ovis larval myiasis among sheep and goats in Central Oromia,
Ethiopia.
Alem F, Kumsa B, Degefu H.
School of Veterinary Medicine, College of Agriculture and Veterinary
Medicine, Jimma University, Jimma, Ethiopia.
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 (chi (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 (chi (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 (chi (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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