Measuring wool cortisol and progesterone levels in breeding maiden Australian merino sheep (Ovis aries).

PLoS One · 2019 · PMC6453452 · PMID 30958853

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a clear trendno p-value reported

These three studies show a clear trend for increasing circulatory progesterone levels throughout gestation with a sharp decline immediately prior to, and after parturition.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.