Abstract
Summary
In all of 20 pigeons completely hypophysectomized from 1 to 287 days earlier the crop-sacs were stimulated by prolactin to proliferation, and often to crop-milk formation within 4 days. These complete responses were obtained in both very immature and in adult individuals. Quantitative measurements made on the operated adults show, however. that their crop-sac response is only about one-eighth that of unoperated mature pigeons.
Complete adrenalectomy did not prevent the usual response of the crop-sacs to prolactin in a test started 4 days after operation. Thyroidectomy did not significantly affect tlie usual crop-sac response to prolactin in a pigeon operated 176 days earlier.
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