by: Dr. G.F. Kennedy
Sheep keds are the most widely distributed and most common external parasite of sheep. They are a wingless fly that spends their entire life time on the sheep and if they fall off don’t survive. When an egg is laid, they pupate for 22 days before emerging. The adults suck blood and cause irritation that results in wool damage and when severely infested can debilitate the sheep.
Treatment requires shearing and pour-on of an insecticide that has residual activity. Permethrin 1% Pour-on is the most effective product available and may be repeated in 21 days in severe infestations. Injectable and pour-on ivermectin products are not very effective.
They are not a tick but a wingless fly.