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The Site of Implantation of Ova in the Rat

Department of Physiology, St. Mary's Hospital Medical School, London

¹ Author's address: Department of Physiology, Charing Cross Hospital Medical School, Chandos Place, London, W.C. 2, U.K.

Received for publication 29 January 1955.

SUMMARY

It is stated that in polytocous mammals the foetuses are implanted evenly down the uterine horns (Boyd & Hamilton, 1949). If rats are killed late in pregnancy, it is certainly found that the foetuses are evenly distributed along the length of the horns. In the course of other work, however, routine laparotomies were performed upon a large number of females 9 days after mating, and the findings apparently failed to agree with the usual belief. In consequence further laparotomies were performed on other females and a careful note was made as to the evenness or otherwise of implantation sites along the horns. The results of this survey, which are given here, showed that implantation was certainly not always as hitherto described.

The rats used were of the Wistar albino strain as developed at the Glaxo Laboratories, Greenford, Middlesex. Mating was determined by the finding of spermatozoa in the uterine smear, and laparotomy was performed 9 days later.

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