Worming ewes around Lambing time has benefits in some circumstances

摘要

When it comes to worming, there is ample debate as to whether adult ewes need treating. In most cases there will be no direct benefit to giving a worming dose to an adult ewe, as they have their own natural immunity and resilience against gut worms.The main consequence of worming ewes unnecessarily is that it will create resistant worms within a flock and that will, in turn, reduce the efficacy of future worming doses. This resistance problem is not restricted to worm. It has also been confirmed that there are sheep scab mites resistant to injectable avermectins (clear wormers).