RELATIVE EFFECTIVENESS OF ESTOSTERONE-PROPIONATE AND DIHYDROANDROSTERONE-BENZOATE IN THE CHICK AS INDICATED BY COMB GROWTH1

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Abstract
In exps. on 214 single-comb White Leghorn chicks, dihydroandrosterone-benzoate was more effective in producing comb growth than was testosterone-propionate. The latter produced greater growth when given in a series of small doses; the former was very effective when given in 1 inj. Combs continued to grow after cessation of treatment, but this was not the result of retention and slow utilization of the hormone; growth was less in chicks caponized at 5 days than in unoperated chicks. Perhaps the normal animals secreted an androgen substance.

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