| anthelmintic resistance of ostertagia ostertagi and cooperia oncophora to macrocyclic lactones in cattle from the western united states. | in june 2008, 122 yearling heifers with a history of anthelmintic resistance were obtained from pastures in northern california and transported to a dry lot facility in southwestern idaho, usa. fifty heifers with the highest fecal egg counts were selected for study enrollment. candidates were equally randomized to treatment with either injectable ivermectin (ivomec, merial, 0.2 mg kg(-1) bw), injectable moxidectin (cydectin), fort dodge, 0.2 mg kg(-1) bw), oral fenbendazole (safe-guard), interve ... | 2010 | 20347229 |