Wright L L, Bell R W, Schreiber H L, Villescas R, Conely L
Dev Psychobiol. 1977 Jul;10(4):331-7. doi: 10.1002/dev.420100407.
Litters of primiparous and multiparous rat mothers received 0,2, or 5 min of cold stress for the 1st 5 days postpartum. Primiparae showed increasing maternal responsiveness over the treatment period. Multiparae were initially maternally responsive to moderate stress cues from pups, but habituated to them over days. From Days 6 to 20, when pups were not stressed, lactation behavior of stressed groups declined in primiparous mothers but not in multiparous mothers.
初产和经产大鼠母亲的幼崽在产后第1至5天接受0、2或5分钟的冷应激。初产大鼠在整个治疗期间表现出母性反应增强。经产大鼠最初对幼崽的适度应激线索有母性反应，但几天后就习惯了。在第6至20天，当幼崽没有受到应激时，应激组的初产母亲的泌乳行为下降，但经产母亲的泌乳行为没有下降。
