control of gastrointestinal nematodes with copper oxide wire particles in a flock of lactating polypay ewes and offspring in iowa, usa.copper oxide wire particles (cowp) have been used to reduce infection of haemonchus contortus in hair breed lambs in southeastern usa without signs of copper toxicity. however, copper sensitivity among breeds and regions varies. the objective was to determine the effectiveness and safety of cowp in lactating polypay ewes and their offspring grazing alfalfa/bluegrass pasture in a rotational grazing system. mature polypay ewes were administered 0, 0.5, 1, or 2 g (n=8 or 9/dose) cowp approximately ...200717433548
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