Use of Monensin Sodium in Caged Layer Replacements for Control of Coccidiosis

Two, paired-house trials were conducted to determine the relative efficacy of monensin sodium for control of coccidiosis in caged layer replacements. Parameters evaluated included clinical diagnosis, weight gain, feed conversion, uniformity, and mortality. Two genetic lines of pullets were included, one on each of two farms. One farm had a history of coccidiosis, whereas it had not been diagnosed on the second farm. One farm had two incidences of coccidiosis, clinically diagnosed, in the amprolium-treated house. Birds on this farm that were fed monensin had lower mortality; feed conversion was improved; the birds were more uniform and weighed approximately 28 g more than birds not receiving monensin. No coccidiosis was diagnosed on the second farm. In caged pullets, inclusion of monensin sodium in feed at levels consistent with the label claim adequately controlled coccidiosis, as evidenced in the parameters evaluated.