THE IMMEDIATE RESPONSE OF THE PLASMA PROLACTIN LEVEL TO OESTROGEN AND PROGESTERONE INFUSIONS IN BULLS

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Abstract
The technique of radioimmunoassay was used to determine prolactin concentration in plasma taken from bulls during and after infusions of oestradiol-17β and progesterone. During the infusion of oestradiol-17β (0.5, 1 and 2 mg) for 1 h the concentration of prolactin in the plasma fell, but showed an immediate increase of up to 6-fold after the infusion was completed. A dose-dependent increase (up to 20-fold) in prolactin concentration was observed after the infusion for 1 h of 5, 10, 40 and 80 mg progesterone. In those experiments in which 40 and 80 mg were administered the depression normally seen during the infusion was sustained for 2–3 h and the subsequent increase during the next few hours was comparatively small.

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