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Development of maternal behaviors in prepubertal rats at three ages: age-characteristic patterns of responses
Insights
Maternal behaviors in juvenile rats are not fully developed or consistent. Exposure to pups helps some maternal actions emerge more easily, showing age-related and developmental differences in young rats.
Area of Science:
- Neuroscience
- Developmental Psychology
- Animal Behavior
Background:
- Maternal behaviors are crucial for offspring survival and development.
- Understanding the developmental trajectory of maternal behaviors is essential for comprehending social behaviors.
Purpose of the Study:
- To investigate developmental differences in maternal behavior expression in prepubertal rats.
- To examine the influence of pup exposure on the emergence of maternal and other behaviors in juvenile rats.
Main Methods:
- Continuous exposure of 18-, 24-, and 30-day-old male and female Wistar rats to 3-8-day old pups.
- Observation and quantification of maternal behaviors (retrieving, anogenital licking, crouching, nestbuilding) and juvenile play behaviors (charge, pounce).
Main Results:
- Maternal behaviors were inconsistently expressed in prepubertal rats.
- Pup exposure facilitated retrieving and anogenital licking more readily than ventral crouching or nestbuilding.
- Age-related differences were observed, with 24-day-olds showing increased retrieving; gender differences were minimal.
- Juvenile play behaviors were linked to retrieving behavior in the context of pup exposure.
Conclusions:
- Maternal behaviors exhibit distinct developmental patterns in prepubertal animals.
- Different mechanisms likely underlie the expression of various maternal behaviors during development.
- Early social exposure influences the emergence of specific maternal and related behaviors in juveniles.
Abstract:
Individual 18-, 24-, or 30-day-old male and female Wistar prepubertal rats (juveniles) were continuously exposed to 3-8-day old pups in order to determine developmental differences in the expression of maternal and other behaviors during the process of sensitization. The results that emerged from this study are as follows: Maternal behaviors are neither consistent nor integrated in their expression prepubertally; exposure to pups facilitates the emergence of some maternal behaviors in juveniles more easily than others, e.g., retrieving and anogenital licking more than ventral crouching or nestbuilding; there are age-related differences in the expression of different maternal behaviors, e.g., 24-day-olds retrieve more than at other ages; in our strain, few, if any, gender differences are apparent in the expression of maternal behaviors prepubertally; juvenile play behaviors (charge, pounce) are related to retrieving behavior in the context of exposure to pups. Overall, the results suggest that maternal behaviors are distinct developmentally and probably involve different mechanisms in prepubertal animals.