MOTHER-WEANLING INTERACTIONS IN NORWAY RATS IN THE PRESENCE OF A SUCCESSIVE LITTER PRODUCED BY POSTPARTUM MATING
MOTHER-WEANLING INTERACTIONS IN NORWAY RATS IN THE PRESENCE OF A SUCCESSIVE LITTER PRODUCED BY POSTPARTUM MATING
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DOI：
10.1016/0031-9384(83)90017-3
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发表时间：
1983-01-01
影响因子：
2.9
通讯作者：
ADLER, NT
中科院分区：
文献类型：
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作者：
GILBERT, AN;BURGOON, DA;ADLER, NT
当雌性挪威鼠(褐家鼠)在产后发情期怀孕时，它们会在哺育第一胎的同时哺育第二胎。第二次妊娠的时间长短不一(在本研究中为23-31天)。调查了母猫和它们的大仔在第二窝幼崽出生前后的行为。六只雌性大鼠在产后发情期分娩并交配。开始对每一只雌性和幼崽进行持续的录像观察。前3天，第2胎出生后持续3天。当第二窝幼崽出生时，年龄较大的幼崽的哺乳行为和筑巢行为并不一定会结束。当第二胎的妊娠时间较短(23-25天)时，较大的幼崽继续在巢中度过时间，并与它们新生的兄弟姐妹一起哺乳。即使在妈妈不在的情况下，这些年纪较大的幼崽也会花很多时间在巢上。当妊娠时间较长(27-31天)时，较大的幼崽在第二胎出生前断奶，与新生儿在巢中的时间较少。雌性幼崽在产前和产后都会对断奶年龄的幼崽进行刻板的攻击。这种母性攻击性似乎并没有阻止断奶幼崽哺乳和筑巢。
When female Norway rats (Rattus norvegicus) become pregnant at the postpartum estrus they nurse this 1st litter concurrently with the gestation of a 2nd litter. This 2nd gestation is of variable length (23-31 days in this study). The behavior of mothers and their older litters around the time the 2nd litter was born was investigated. Six female rats gave birth and were mated at the postpartum estrus. Continuous videotaped observation of each female and litter began .apprx. 3 days before, and continued for 3 days after the birth of the 2nd litter. Suckling behavior and nest attendance by the older litter did not necessarily end when the 2nd litter was born. When the gestation length of the 2nd litter was short (23-25 days) older pups continued to spend time in the nest and to nurse along with their newborn siblings. These older pups also spent much time on the nest even in the absence of their mother. When gestation was long (27-31 days) older pups were weaned before the birth of the 2nd litter and spent less time on the nest with the newborns. Stereotyped attacks by the female against her weanling age pups were seen both pre- and postpartum. This maternal aggression did not appear to deter suckling and nest attendance by the weanlings.