Yes x 1 million. Especially for horses, which if a closed herd, probably don't have ANY worms and probably don't need anything. My horses haven't had dewormer in years.I've heard you really need to take fecal samples for a vet to check to see what worms you need to target and use what works best.
NO x 1 million. It makes ZERO sense unless you're trying to keep me employed forever.Also stay with an Ivomec type product until it shows resistance then switch to one of the white drench dewormers. Makes sense.