生乳素(以下简称PRL)对发动和维持大鼠的授乳有重要作用,分娩后大鼠在授乳期血中PRL水平很高,将仔鼠与母鼠分离,则PRL分泌降低,乳汁分泌减少,反之,在分离若干小时后再将仔鼠送回母鼠身边,吸吮乳汁将引起血PRL水平迅速升高,表明授乳期PRL分泌与吮乳刺激紧密关联。 Lactogen (PRL) plays an important role in mobilizing and maintaining lactation in rats. After delivery, the PRL level in blood of lactating rats is very high. When PRLs are separated from their mothers, PRL secretion is reduced and milk secretion is reduced. On the contrary, after a few hours of separation, the offspring will be returned to the mother’s body, sucking the milk will cause the blood PRL level to rise rapidly, indicating that lactating PRL secretion is closely related to sucking stimulation.