Ravault J P, Martinat-Botte F, Mauget R, Martinat N, Locatelli A, Bariteau F
Biol Reprod. 1982 Dec;27(5):1084-9. doi: 10.1095/biolreprod27.5.1084.
In wild boars and sows, plasma prolactin varied among seasons with highest levels in July and lowest during the winter months. In domesticated breeds of pigs, plasma prolactin of intact boars did not vary among seasons but plasma prolactin of gilts tended to be higher in the summer than in winter. However, this difference was more conclusive in ovariectomized as compared to intact gilts. There was not a significant circadian rhythm in hourly samples from ovariectomized gilts.
在野猪和母猪中，血浆催乳素水平随季节变化，7月最高，冬季最低。在猪的驯化品种中，未阉割公猪的血浆催乳素水平不随季节变化，但后备母猪的血浆催乳素水平夏季往往高于冬季。然而，与未阉割的后备母猪相比，这种差异在去卵巢的后备母猪中更明显。去卵巢后备母猪的每小时样本中没有明显的昼夜节律。
