If you do intend to breed your sheep, however, preemptive drenching should be done four weeks before lambing. Lambs should be drenched one or two weeks after weaning.

When should you drench your sheep?

Lambs should be drenched a week or two before weaning. It is important that after you have drenched your sheep, they are put onto clean pasture and the old pasture spelled for as long as possible.

How many times a year should you drench sheep?

As a general guideline, non-breeding sheep should need a single drench a year, and lambing ewes and weaners two drenches. Please keep in mind that conditions on your property and in your region will ultimately affect how many drenches you need.