Relation between daylight ratio, plasma progesterone levels and timing of nidation in mink (Mustela vison)

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Abstract
Mink were mated between Feb. 17 and March 22. In females kept in natural daylight concentrations of progesterone, measured by radioimmunoassay, began to rise between March 25 and 30, whatever the date of mating. After reaching peak values of 40-160 ng/ml, progesterone concentrations decreased before the end of pregnancy. In females given 14 h light/24 h immediately after mating, the rise of progesterone began a few days earlier, indicating that the extra light induces earlier progesterone secretion, nidation and parturition.

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