Larry Hollis calls it the clean cow-clean pasture concept. That's his answer to the question of when you should worm your cows. "The way I look at it," says the Kansas State University Extension veterinarian, "when you go to clean pasture, put clean cows out there." That way, he says, you reduce the level of egg and larvae contamination in the pasture, which is the major source of the worm load that cows and eventually their calves will carry.
展开▼
