This survey was carried out to determine the infestation rate of Oestrus ovis larvae and its seasonal dispersion in Urmia. A number of 402 sheep heads were examined in Urmia slaughterhouse and all O. ovis larvae of each head were collected. Thirty three sheep heads were examined each month during 12 months from 2006 to 2007. Of 402 heads, a number of 122 heads (30.34%) were infested with O. ovis larvae. The prevalence of nasal myiasis in spring, summer, fall and winter were 32.32%, 28.43%, 33.66% and 27% respectively which were not significantly differed (P>0.05). The results showed that the infestation rate of O. ovis in different age groups including 6-24 months, 2 to 4 years, and older than 4 years were 17.39%, 28.33% and 35.68% respectively. The age specific infestation rates among age groups were significantly differed (P<0.05). Highest and lowest infestation rate was in Gezel and Haraki breeds respectively. The differences in infestation rate among sheep breeds were not statistically significant (P>0.05). This study suggests a high rate of infestation to O. ovis and highlights the parasite infestation’s economic damages in this region and demands further research in order to reducing the rate of infestation in sheep.
کلید واژگان :sheep, oestrus ovis, seasonal infestation, urmia
ارزش ریالی : 600000 ریال
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