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Effects of lasalocid (.0125%) in combination with roxarsone on lesion reduction and oocyst suppression in chickens infected with Eimeria tenella field isolates.

Lasalocid (.0125%) alone and combined with roxarsone (.005%) was evaluated for its effect on lesion reduction and oocyst suppression in thirty-five controlled replicated battery experiments, using in excess of 6200 broiler chickens. The chickens were inoculated with field isolates containing predominantly Eimeria tenella species. Lasalocid (.0125%) used alone exhibited a high degree of anticoccidial activity. Lasalocid (.0125%) fed in combination with roxarsone (.005%) showed, in addition to high anticoccidial activity, a further reduction in gross lesion (P less than .01) and oocyst production (P less than .05) over lassalocid used alone.