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Journal of Experimental Biology 11,279-282 (1934)
Published by Company of Biologists 1934

The Effect of Suckling on the Duration of Pregnancy in the Rat (Wistar Albino)

A. M. HAIN PH.D.¹

¹ Institute of Animal Genetics, University of Edinburgh

1. As is the case in mice, pregnancy is prolonged in the rat when the pregnant mother is suckling young. When only three or four are suckled the ensuing pregnancy may be of normal duration.

2. No correlation exists between the number suckled and the extent by which gestation is prolonged, and there are individual variations in the effect upon gestation of the same number of young.

3. In a stock in which microphthalmia had been encountered, the delayed implantation of the ova due to suckling was found to have no effect upon the distribution of the abnormality.