Abstract
The drinking water of 1,021 sexed Small White poults fed eight experimental or commercial rations was either unmedicated or medicated for 6 days with chlortetracycline alone or combined with soluble vitamins. Unexpectedly cool weather during the 1st week decreased early growth and feed conversion; mortality to 10 days was increased (11.9% of males and 4.5% of females). The water medication did not influence mortality or improve early or subsequent growth performance or feed efficiency.
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