Selecting for Parasite Resistant Katahdins
People frequently ask us for suggestions on improving the parasite resistance of their flocks and how to identify resistant animals, and with good reason. Intestinal worms, or parasites, are one of the most limiting factors to profitable production for shepherds raising sheep on pasture. Lambs and late gestation and lactating ewes are the most susceptible. The main parasite of concern in much of the U.S. is Haemonchus contortus or barber pole worm. The most obvious cost to producers is through deaths of lambs and ewes. But probably more loss occurs in lambs because of anemia, reduced appetite, slower growth, delays…