Abstract

It has been reported by Groschke and Evans (1950) that the injection of aureomycin, by McGinnis et al. (1950) of aureomycin or streptomycin, by Whitehill et al. (1950) of aureomycin or penicillin, did not result in a growth response in chicks. However, Elam et al. (1951 a, b, c) reported that injection of penicillin or bacitracin, but not aureomycin, stimulated growth in chicks. Dixon and Thayer (1951) reported that injection of penicillin or aureomycin gave a growth response equal to or greater than that resulting from oral administration. Stephenson (1951) found that injected bacitracin gave a growth response in chicks. Coates et al. (1952) also obtained a growth response from injected penicillin as great as obtained by oral administration. Becker et al. (1951) obtained a growth response in pigs by injection of penicillin.In view of the finding of Noland et al. (1952) that subcutaneous implantation into pigs, at the .

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