Progesterone in blood. IV. Progesterone in the blood of mares. Progesterone levels have been measured in the peripheral blood of pregnant and non-pregnant
mares, and in umbilical cord blood collected during foaling. It was found that progesterone was
readily detectable in the blood of pregnant and non-pregnant animals provided that there was a
fully developed corpus luteum present in the ovaries. During the second half of gestation, when
the ovaries have become fibrotic, progesterone was no longer detectable in the peripheral blood,
even though it was present in high concentrations in umbilical cord blood.
The reasons for this apparent disappearance...
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