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OJVRTM
Online Journal of Veterinary Research ©
Volume 4 : 133-138, 2000.
Updated 23-06-02
Effect of azadirachtin on
Damalinia ovis
in sheep
Guerrini VH.
Pestsearch International Pty Ltd,
ABSTRACT
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