White wormers (benzimidazoles) work well at killing adults in the GI tract, he adds. The two subclasses of the macrocyclic ...

and pastures can only be infected by cows carrying adult stomach worms. Worms that are resistant to a dewormer (less than 90% are killed by the treatment) survive and lay eggs that are deposited ...

The cows can be expected to winter better, have a higher conception rate the next breeding season, and wean heavier calves. Deworming with one of several anthelmintics (wormers) approved for use in ...

Some believers were ingesting the de-wormer prophylactically as part of ... overdosing on the farm-grade ivermectin sold for use on cows and horses. Poison control hotlines reported pretty big ...