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Online Journal of Veterinary Research ©
Volume 4 : 133-138, 2000.
Effect of azadirachtin on Damalinia ovis in sheep
Pestsearch International Pty Ltd,
Guerrini VH., Effect of azadirachtin neem seed extracts on Damalinia ovis in sheep. Online J Vet Res 4:133-138, 2000. Azadirachtin neem seed extract is a powerful insect growth regulator, feeding deterrent and repellent. However, azadirachtin degrades rapidly in light, excessive heat or alkalinity. The effects of unprotected and UV protected azadirachtin in neem seed extracts on Damalinia ovis were evaluated on sheep for 6 months. Animals were sprayed once with methanolic neem seed extracts containing 40, 80, 160, 320, 640, 1280 ppm azadirachtin and tween-wool wax formulations containing 2000 ppm azadirachtin. Effective wool retention was evaluated by periodically counting lice in treated sheep tied to untreated lousy sheep. For 6 days after treatment, increased azadirachtin concentrations correlated (P <0.0001) with reductions in lice. After Day 6, 80 to 1280 ppm reduced lice 98-100% and prevented re-infestation for 6 months. In tween or wool fat, azadirachtin reduced lice 100% from Day 2 and 94-96% from Day 96 to Day 170. The findings suggested that relatively low concentrations of azadirachtin inhibited lice on sheep for long periods. On long wooled sheep, azadirachtin may be retained in lanolin and thus protected from UV light and oxidation.
KEYWORDS: Azadirachtin, Damalinia ovis, sheep