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Plasma prolactin levels in sows during pregnancy, parturition and early lactation

Summary. Mean prolactin concentrations in the blood plasma ranged from 4·4 to 13·0 ng/ml during pregnancy up to the 2nd day pre partum. Concentrations increased to 20·3 ng/ml 2 days before and 103·4 ng/ml at 1 day before the start of farrowing. During farrowing values ranged from 124·2 to 147·3 ng/ml. On the 5th day of lactation the prolactin levels had fallen to 43·1 ng/ml.