EFFECT OF SEX HORMONES, SEPARATELY AND COMBINED, ON THE PROLIFERATION AND HYDRATION OF COMBS AND CLOACAE OF MALE CHICKS

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Abstract
Estradiol dipropionate, in effective doses, produced a "puffing" reaction in the cloacal region of [male] baby chicks as early as 48 hrs. after the 1st inj. This reaction was progressive under continued treatment until the cloaca resembled that of a laying hen. Testosterone propionate produced an initial "puffing" reaction accompanied by hyperemia but the cloaca did not show the same progressive enlargement. The estrogen-treated chicks showed a very extensive en largement of the sex eminence. The same wt. dose of androgen also produced greatly enlarged but comparatively smaller eminences. The combs were tremendously stimulated by testosterone propionate but estradiol dipropionate produced no measurable increase in comb wt. Stimulation of combs and cloacae was accompanied by a sharp rise in water content of the tissues. There was no marked evidence of either synergism or antagonism of action between the [male] and [female] hormones used. The Barred Rocks showed a much smaller degree of response in all respects than did the White Leghorns.

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