The effectiveness of lasalocid as a coccidiostat in wool producing feedlot lambs was investigated. Significantly lower (P less than 0,001) oocyst numbers were obtained with the lasalocid diet as opposed to the controls receiving no lasalocid. No significant differences were found with regard to wool growth and related properties such as staple length, crimp, fibre thickness, clean yield and clean wool weight. The lasalocid diet improved the efficiency of feed utilization by 6%.
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