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Biology of Reproduction, Vol 23, 994-999, Copyright © 1980 by Society for the Study of Reproduction

Postpartum Estrus in Norway Rats. I. Behavior

JAMES R. CONNOR 1, and HARRY N. DAVIS 1

1 Wright State University, School of Medicine, Department of Physiology, Dayton, Ohio 45435


Female rats in the wild appear to mate and conceive during a brief period of postpartum estrus, usually within the first 24 h following parturition. This shortens the interval between successive litters and can thereby greatly increase the female’s overall reproductive output. This study presents a quantitative analysis of the time of onset, duration, and quality of the receptive behavior of females during this time. Females were tested for receptivity every 3 h following the delivery of the first pup. The percentage of females displaying lordosis rose rapidly from 30% at 6 h to 100% at 9 h and at 12 h. Receptivity declined steadily after 12 h, with 20% showing lordosis at 21 h. The quality of lordosis followed a similar curve. The postpartum estrus appeared to depend more upon the onset of parturition than it did upon the ambient photoperiod.

Submitted on June 20, 1980
Accepted on September 24, 1980




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