Abstract
The concentration of zinc in the endometrium of the roe deer was maintained at a constantly high level throughout delayed implantation and at the time of rapid embryonic growth. By contrast, the zinc content of the uterine flushings was uniformly low and often undetectable (PP<0·001) rise in the late stages of diapause followed by a further marked increase during the rapid elongation of the blastocyst in January.

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