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 ...

Dairy calves confined to small lots around the farmstead may need to be wormed several times during the summer. Worming of cattle at the time they enter the feedlot is cost-effective only if the load ...

The study looked at the number of parasite eggs in cattle feces before and after using different classes of dewormers. “If we saw a 90% reduction in the fecal egg count at 14 days post-deworming as ...