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Post-coital unilateral ovariectomy in rabbits (Little, Haynes & Lamming, 1970), rats (Lamming & Little, 1968) and mice (Bruce, Renwick & Finn, 1968) impairs embryonic survival in the ipsilateral uterine horn. These findings suggest that each ovary controls conceptus survival in its adjacent uterine horn. The existence of such a mechanism has been disputed in the rat (Wu & Dickmann, 1971) and mouse (McLaren, 1970), and conflicts with the premises involved in induction of bilateral blastocyst implantation after ovariectomy using exogenous hormones. McLaren (1970) worked with the Q strain, and Bruce et al. (1968) demonstrated a variation of the local effect between the P and TO strains. Our aim was to uncover any local effect in a fourth strain of mice.

Swiss Webster albino mice were maintained and anaesthetized as described previously (Holmes & Dickson, 1971). Bilaterally ovariectomized, sham bilaterally ovariectomized, left unilaterally ovariectomized and right unilaterally ovariectomized groups were studied.