[Radioimmunoassay of Bovine Serum Progesterone]
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Radioimmunoassay determination of plasma progesterone in the cow without chromatographic purification was developed. The level ranged from 0.6 ng/ml during estrus to 6.4 ng/ml during the luteal phase. The progesterone level declined rapidly 48 to 72 h before estrus beginning.
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