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 (<0·1 μg/ml).
The concentration of calcium in the endometrium showed a highly significant (P<0·001) increase during delayed implantation reaching maximal levels upon the resumption of rapid embryonic growth. The calcium content of the uterine flushings showed a small but significant (P<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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