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

Schildknecht, E.G.; Edgar, S.A.; Givens, S.V.

Poultry Science 59(5): 1145-1147


ISSN/ISBN: 0032-5791
PMID: 7393845
DOI: 10.3382/ps.0591145
Accession: 000647800

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In 35 controlled replicated battery experiments involving over 6200 broiler chickens, chickens were inoculated with field isolates of coccidia (containing predominantly Eimeria tenella). Medicated feed was fed from 2 days before infection for a total of 11 consecutive days. Lasalocid (at 0.0125%) used alone exhibited a high degree of anticoccidial activity. It eliminated or reduced lesions and oocyst output to a negligible amount. This made it impossible to evaluate the effect of roxarsone addition (at 0.005%) in some of the studies. However, when evaluation was possible, it was found that roxarsone addition led to a further reduction in gross lesions and oocyst production over lasalocid used alone.