Robinson S R, Smotherman W P
Center for Developmental Psychobiology, Department of Psychology, SUNY-Binghamton 13902-6000.
Dev Psychobiol. 1992 Jan;25(1):33-49. doi: 10.1002/dev.420250104.
Intraoral infusion of milk reliably elicits a stretch response in the rat fetus. The fetal stretch response appears isomorphic to the stereotypic behavior exhibited postnatally by suckling rat pups during milk ejection. Using a procedure that permits direct fetal observation, milk infusions were delivered to rat fetuses on Day 20 or 21 of gestation. Infusion of milk promoted systematic changes in fetal behavior that culminated in expression of the stretch response nearly 3 min later. Interruption of this behavioral sequence prevented stretching, suggesting that a period of behavioral reorganization after milk infusion is necessary but not sufficient for the stretch response to occur. The behavioral sequence initiated by the fetal rat's first exposure to milk is remarkably similar to the behavior exhibited by experienced infant rats at the nipple.
经口向大鼠胎儿输注牛奶能可靠地引发伸展反应。胎儿的伸展反应似乎与出生后吸乳的幼鼠在乳汁排出时表现出的刻板行为相似。采用一种允许直接观察胎儿的方法，在妊娠第20天或第21天向大鼠胎儿输注牛奶。输注牛奶促使胎儿行为发生系统性变化，最终在近3分钟后出现伸展反应。中断这一行为序列可阻止伸展反应，这表明牛奶输注后的一段行为重组期对于伸展反应的发生是必要的，但并不充分。胎鼠首次接触牛奶引发的行为序列与有经验的幼鼠在乳头处表现出的行为非常相似。
