Lynch A
Dev Psychobiol. 1976 Jan;9(1):39-48. doi: 10.1002/dev.420090107.
Rat pups were undernourished from birth by placing them for 12 hr/day with a normal lactating mother and 12 hr/day with a nipple-ligated mother each day for 25 days. The method resulted in a marked delay in the body growth of the undernourished pups, especially during the first 2 weeks of life. Observations of the behavior of the mothers towards the underfed pups were made at different times of the day and compared to the behavior of the mothers suckling well-fed pups. The results show that (1) nipple-ligated mothers are able to provide adequate maternal care for undernourished pups, and (2) both ligated and nonligated mothers caring for underfed pups spend more time with those pups than mothers caring for well-fed pups.
通过将新生的幼鼠每天与正常哺乳的母鼠相处12小时，与乳头结扎的母鼠相处12小时，持续25天，使幼鼠从出生起就营养不良。该方法导致营养不良幼鼠的身体生长明显延迟，尤其是在出生后的前两周。在一天中的不同时间观察母鼠对营养不良幼鼠的行为，并与哺乳喂养良好幼鼠的母鼠行为进行比较。结果表明：（1）乳头结扎的母鼠能够为营养不良的幼鼠提供足够的母性关怀；（2）照顾营养不良幼鼠的结扎和未结扎母鼠与这些幼鼠相处的时间比照顾喂养良好幼鼠的母鼠更长。
