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FACTORS CONTROLLING THE LIFE-SPAN OF THE CORPORA LUTEA IN THE PSEUDOPREGNANT RABBIT

Summary.: The life-span of corpora lutea (CL) of varying ages within the one rabbit was studied by an experimental procedure in which 2-day-old CL removed from donor rabbits were transferred beneath the kidney capsule of recipient rabbits. Within oestrous recipients, the CL were found to have a total life-span of approximately 17 days, which was similar to that of ovarian CL in the pseudopregnant rabbit. When the CL were transferred into 12-day pseudopregnant rabbits, their life-span was reduced to approximately 11 days and both the ovarian and transferred CL regressed at approximately the same time. It was suggested that a uterine factor may have caused the early regression of the transferred CL since hysterectomy at the time of transfer prolonged the life-span of each set of CL to approximately 23 to 27 days. In these animals, the CL regressed asynchronously.

Prostaglandin F₂ caused early regression of the ovarian CL when given to hysterectomized rabbits.