The Efficacy of Monensin Against One Sensitive and Thirteen Drug Resistant Strains of Eimeria tenella

Monensin, admixed with the feed at a level of 0.0125%, adequately protected chickens against experimental infections of Eimeria tenella initiated by a strain that had no previous exposure to drugs as well as by strains resistant to amprolium, arsenosobenzene, buquinolate, clopidol, decoquinate, glycarbylamide, nequinate, nicarbazin, nitrofurazone, Novastat, Trithiadol, Unistat, or zoalene, respectively. When fed to uninfected chickens, monensin did not affect rate of gain to a significant degree in three of four replicates. Moreover, an analysis of the aggregate data did not indicate a significant difference in rate of gain between the uninfected group.