Pieper D R, Gala R R
J Endocrinol. 1979 Aug;82(2):279-85. doi: 10.1677/joe.0.0820279.
The role of the pineal gland, olfactory bulbs and photoperiod in the regulation of the two daily surges of plasma prolactin in the pseudopregnant rat has been investigated. Pinealectomy had no effect on the surges of prolactin in pseudopregnant rats maintained on either a long (14 h light : 10 h darkness; 14L : 10D) or a short (2L : 22D) photoperiod, but olfactory bulbectomy decreased the nocturnal surge in animals maintained on 14L : 10D. This effect of bulbectomy was eliminated if the rats maintained on 14L : 10D were also pinealectomized. After cervical stimulation, bulbectomized rats maintained on a 2L : 22D photoperiod had nocturnal-type prolactin surges similar to those of intact rats maintained on the same photoperiod. These results indicate that the pineal gland andlength of photoperiod are not involved in the regulation of the surges of plasma prolactin in pseudopregnant rats but that the olfactory bulbs may enhance the nocturnal surge.
松果体、嗅球和光周期在假孕大鼠血浆催乳素每日两次分泌高峰调节中的作用已得到研究。松果体切除对处于长（14小时光照：10小时黑暗；14L：10D）或短（2L：22D）光周期的假孕大鼠的催乳素分泌高峰没有影响，但嗅球切除降低了处于14L：10D光周期动物的夜间分泌高峰。如果处于14L：10D光周期的大鼠也进行松果体切除，嗅球切除的这种作用就会消除。在颈部刺激后，处于2L：22D光周期的嗅球切除大鼠出现与处于相同光周期的完整大鼠相似的夜间型催乳素分泌高峰。这些结果表明，松果体和光周期长度不参与假孕大鼠血浆催乳素分泌高峰的调节，但嗅球可能增强夜间分泌高峰。
