Relaxin in the Ovary of the Domestic Sow (Sus scrofa L.).

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Abstract
No relaxin is found in the ovaries of the.gilt nor of the sow during the follicular phase of the estrous cycle. There is, however, 2.5 to 5 Guinea Pig Units (G.P.U.) of relaxin per g. of ovarian tissue present during the luteal phase of the cycle. The amt. of relaxin in the ovaries increases rapidly during pregnancy and reaches a max. concn. of approx. 10,000 G.P.U. per g. of tissue by the time the fetuses attain a length of 5 or 6 inches. The blood at mid-pregnancy contains 2 G.P.U. per ml. while the placenta has 0.5 to 2.5 G.P.U. per g.
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