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  • Author: THOMAS E. McGILL x
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R. B. LAND and THOMAS E. McGILL

Summary.

Female mice were placed with males and subjected to three different treatments. One group experienced a low number of pre-ejaculatory thrusts, the ejaculatory reflex and the formation of a copulatory plug. A second group experienced a variable number of pre-ejaculatory thrusts, the ejaculatory reflex and the formation of the copulatory plug which was immediately removed. The third group experienced a variable number of pre-ejaculatory thrusts only. The results indicated that a large number of pre-ejaculatory thrusts is neither necessary, nor sufficient, for the induction of luteal activity in the female mouse. The ejaculatory reflex and the formation of the copulatory plug are sufficient to induce luteal activity regardless of the number of pre-ejaculatory thrusts. The results are compared with those of similar work on the rat.

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THOMAS E. McGILL, DAVID M. CORWIN and DAVID T. HARRISON

Summary.

Female mice were mated to males that had been surgically rendered incapable of forming copulatory plugs. About half of the females were found to be pregnant, and the other half pseudopregnant, as a result of these matings. In both cases, mating with the operated males resulted in the induction of luteal activity in the female.