Uptake of P 32 by Pigeon Crop-Sac as Index of Lactogenic Hormone. ∗

Summary

Studies were conducted on ability of purified and crude lactogenic preparations to stimulate incorporation of P³¹ and P³² in crop-sac of pigeon. Lactogenic hormone injected intradermally over one side of crop-sac stimulated significant P³¹ and P³² incorporation as compared to control sides. Diametric responses were correlated with % P³² uptake after injection of crude pituitary homogenates with a resultant correlation coefficient of .79, indicating that P³² incorporation is primarily a function of lactogenic activity of homogenate injected.