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GUY H. KIRACOFE and HAROLD G. SPIES

Summary.

Regression of the corpora lutea was hastened in hysterectomized-pseudopregnant rats by parabiotic union with ovariectomized partners. Hysterectomized-pseudopregnant rats paired either with hysterectomized-pseudopregnant or with normal cycling partners had periods of pseudopregnancy similar in length to those in unpaired hysterectomized-pseudopregnant control females. Injections of ether-soluble extracts or of lyophilized homogenates of oestrous rat uteri did not shorten pseudopregnancy in hysterectomized rats.

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GUY H. KIRACOFE and HAROLD G. SPIES

Summary.

Hysterectomy in ewes 3 to 6 days post-oestrus resulted in prolonged corpora lutea maintenance; luteal regression, however, had occurred by about 150 days post-oestrus. Hysterectomized ewes reovulated after luteal regression and maintained the resulting corpora lutea for a similar period of time. Corpora lutea induced with exogenous gonadotrophins after hysterectomy regressed asynchronously with naturally formed corpora lutea present at the time of the induced ovulation, and the significance of this is discussed.

Hysterectomy during anoestrus resulted in ovulation without oestrus and maintenance of subsequent corpora lutea.