Pup age and aggressive behavior in lactating rats
Pup age and aggressive behavior in lactating rats
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DOI：
10.1590/s0100-879x2000000900015
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发表时间：
2000-09-01
影响因子：
2.3
通讯作者：
Lucion, AB
中科院分区：
文献类型：
--
作者：
Giovenardi, M;Consiglio, AR;Lucion, AB
雌性大鼠在产后前10天表现出对巢内入侵者的高水平攻击行为，此后下降到非常低的水平，即使继续哺乳，也进行了交叉培养实验，以验证幼鼠年龄可能影响哺乳期大鼠攻击性的假说。比较了产后第8天饲养8日龄雌性和产后第8天饲养大龄(18日龄)后5日龄雌性的行为，以及产后第18天饲养18日龄雌性与同期哺育幼崽(母体攻击试验时为8日龄)5日龄雌性的行为比较，并分析了PUP活性和血浆催乳素水平，产后第8天哺育18日龄雌性比同一产后同一时期雌性更具攻击性。但是有了8天大的幼崽。同样，在产后第18天哺育幼崽的雌性比哺育年长幼崽的雌性更具攻击性，并呈现出更高的催乳素水平，因此，幼崽的发育可以改变母体攻击行为的自然下降。
High levels of aggressive behaviors against intruders in the nest area are displayed by female rats during the first 10 days after delivery, declining thereafter to very low levels, even though lactation continues, Cross-fostering experiments were undertaken to test the hypothesis that pup age may affect aggression in lactating rats. The behavior of females on the 8th day after delivery when raising fostered 8-day-old pups was compared to that of females on the 8th postpartum day raising older pups (18 days old) for the last 5 days, and females on the 18th day after delivery raising fostered 18-day-old pups were compared to females in the same postpartum period nursing younger pups (8 days of age at the time of the maternal aggression test) for 5 days, Pup retrieval activity and plasma prolactin level were also analyzed, Females on the 8th postpartum day nursing 18-day-old pups were less aggressive than females in the same postpartum period, but with 8-day-old pups. Likewise, females on the 18th postpartum day nursing younger pups were more aggressive and presented higher levels of prolactin than females nursing older pups, Thus, pup development can alter the natural decline of maternal aggressive behavior.