Ontogeny of sex differences in defensive burying behavior in rats: Effect of social isolation
Ontogeny of sex differences in defensive burying behavior in rats: Effect of social isolation
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DOI：
10.1002/ab.20165
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发表时间：
2007-01-01
影响因子：
2.9
通讯作者：
Arakawa, Hiroyuki
中科院分区：
文献类型：
--
作者：
Arakawa, Hiroyuki
本实验的目的是阐明影响大鼠防御行为的社会发展因素中的性别差异。在幼年、青春期、成年和30日龄、50日龄和80日龄三个发育阶段，探讨了大鼠防御掩埋行为的性别差异及其相关的社会因素。在电击刺激试验中测量埋葬、挖掘被褥材料、伸展姿势和蹲下/冻结的时间。对于男性来说，幼年和青春期埋葬的时间比成年期要长。对于女性，埋葬时间没有年龄差异。在青春期和青春期，雄性的埋藏时间都比雌性长。无论男女，挖掘持续时间都在幼年期最长，且女性的挖掘持续时间长于男性。在幼年阶段，从26天到40天被隔离的雄性和雌性大鼠，与配对饲养的大鼠相比，埋葬行为的持续时间更短。这种幼年隔离的效果在成年雄性和雌性中都保持着，即使它们在隔离后回到配对饲养中。在成年期间，从66天到80天的隔离，增加了雄性的埋葬行为，但减少了雌性的埋葬行为。挖洞、伸展姿势和蹲/冻的持续时间不受隔离的影响。在成年雄性大鼠中，防御掩埋的减少和隔离导致的增加，表明雄性类似成人的社会关系的出现抑制了掩埋的持续时间。在幼年阶段隔离的雄性和雌性大鼠保持较低的掩埋水平，这表明青少年时期的社会经验对于防御性掩埋行为的出现很重要。
The aim of the present experiments was to clarify sex differences in socio-developmental factors that affected defense behavior in rats. Sex differences in the defensive burying behavior of rats, and related social factors, were explored in three developmental stages: juvenile, puberty, and adult; 30, 50, and 80 days of age, respectively. The duration of burying, digging into bedding material, stretch-attend postures, and crouch/freezing were measured in a shock-prod test. For males, the duration of burying was longer in the juvenile and pubertal stages than in adulthood. For females, no age differences in the duration of burying were found. Males showed longer burying durations than females in both the juvenile and pubertal stages. For both sexes, the highest duration of digging was found in the juvenile stage, and females showed longer durations of digging than males. Both male and female rats isolated during the juvenile stage, from 26 to 40 days of age, showed smaller durations of burying behavior compared to pair-reared rats. This effect of juvenile isolation was maintained among both adult males and females even when they were returned to pair rearing after isolation. Isolation during adulthood, from 66 to 80 days of age, increased burying behavior in males, but decreased it in females. The durations of digging, stretch-attend postures, and crouch/freezing were not affected by isolation. The decrease in defensive burying and its increase resulting from isolation in adult male rats, suggest that the emergence of adult-like social relationships in males suppressed the duration of burying. Male and female rats isolated during the juvenile stage maintained lower levels of burying, suggesting that social experience as juveniles is important for the emergence of defensive burying behavior.