Foetal and maternal blood samples are taken on the sow at the end of pregnancy. No variations in maternal cortisol are found, but plasma cortisol levels in the foetus, which are relatively constant between days 70 and 100 of pregnancy (10 to 20 ng/ml), increase suddenly at the end of pregnancy reaching a mean of 210 ng/ml at birth. This high increase of foetal corticosteroids at birth, similar to that found in other species (ewe, goat, etc.), probably plays a role in the mechanisms releasing parturition. It also permits us to understand the action of ACTH which induces premature birth when given to the pig foetus in the last days of pregnancy.
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