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Plasma progesterone levels during delayed implantation in the European badger (Meles meles)

Summary. There was a biphasic pattern of progesterone secretion during the year. Delayed implantation was characterized by low concentrations from February to June, a significant (P < 0·001 ) increase during July, August and September, and a return to low levels in October–November. A second significant increase (P < 0·001) was observed in December and early January just before the presumed time of implantation.

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