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The progesterone concentrations were determined in 5 cows in oestrus, 5 cows in the luteal phase of the cycle, and 16 cows at 20-62 days after mating. In blood plasma, morning milk and evening milk, the progesterone concentration (±standard deviation) averaged 0.63±0.13, 2.8±0.2 and 3.4±0.6 ng/ml...

Hashizume, T.; Niwa, T.; Kimura, H.
Bulletin of the Laboratory of Artificial Insemination, Iwate University, 1981, No. 2, pp 60-65