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Synopsis
Three hundred and eighty‐four Aylesbury ducklings were divided into two groups. From 8 days of age one group was fed on a basal ration and the other this ration supplemented with 45 g. of oxytetracycline hydrochloride per ton of food. The antibiotic tended to increase live‐weight gain and to thin the alimentary canal, but the only significant difference was in the weights of 1 cm. lengths of the caeca.
Three hundred Khaki Campbell laying ducks were kept in two groups, one group being fed on a basal pelleted diet and the other this diet supplemented with 100 g. of oxytetracycline hydrochloride per ton. Egg production was significantly increased by the antibiotic, but body weight was not significantly affected. There was a tendency for the alimentary canal to be thinned by the antibiotic, but the only significant difference was in the average percentage weights of the small intestine.