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A simple probe especially designed to take electrical resistance measurements at different positions in the anterior vagina of a cow was compared with milk progesterone determinations on 108 cows. Milk samples were taken 3× weekly, 21 to 60 d postpartum, at the time of insemination, and 21 to 23 d later. Electrical resistance measurements were made on a similar schedule. In 10 other herds, 187 cows...