Synthetic pyrethroid pour-on for the prevention and treatment of blowfly strike, the control of headflies and the treatment of lice and ticks on sheep and lambs. Crovect 1.25% w/v Pour-On Solution for Sheep is a mobile, blue coloured, non-aqueous pour-on containing 1.25% w/v cypermethrin (cis:trans/80:20) for external application. Meat & Milk Withdrawals: Sheep - meat 8 days Sheep - milk 5 days