Related Experiment Video
Updated: Aug 17, 2026
Moderate Prenatal Alcohol Exposure and Quantification of Social Behavior in Adult Rats
Published on: December 14, 2014
Early postnatal protein malnutrition changes the development of social play in rats
Lucilla Maria Moreira Camargo1, Sebastião de Sousa Almeida
1Department of General Psychology and Behavior Analysis, Londrina State University, Campus Universitário, Londrina, PR, 86051-990, Brazil.
Insights
Early protein malnutrition in rats significantly impacts social play development. Malnourished rats showed altered play behaviors and developmental delays, suggesting effects on neural mechanisms.
Area of Science:
- Neuroscience
- Developmental Biology
- Animal Behavior
Background:
- Early life nutrition is critical for brain development.
- Protein malnutrition can lead to structural and functional brain changes.
- These changes may affect social interactions and behavior.
Purpose of the Study:
- To investigate the long-term effects of early postnatal protein malnutrition on social play in rats.
- To analyze how different dietary conditions post-weaning influence play behavior ontogeny.
Main Methods:
- Rats were fed either a 16% protein (well-nourished) or 6% protein (malnourished) diet during lactation.
- Post-weaning, malnourished rats were either maintained on the low-protein diet or switched to a standard diet.
- Social play behaviors (pinning, wrestling, walk-over, rear) were recorded and analyzed at various ages.
Main Results:
- Malnourished rats exhibited a significantly higher frequency of wrestling and walk-over behaviors.
- Early protein malnutrition altered the developmental trajectory of play behaviors, causing delays.
- These developmental delays were particularly evident at 46 and 56 days of age.
Conclusions:
- Early protein malnutrition has lasting effects on the development of social play in rats.
- Dietary interventions post-weaning did not fully reverse the observed behavioral changes.
- These findings suggest that early malnutrition impacts the neural systems governing social play behavior.
Abstract:
Early protein malnutrition produces structural and functional alterations in the brain and changes the organism-environment interactions. Rats from 26 to 76 days of age were used to study the effects of early postnatal protein malnutrition on the development of social play. During lactation phase the litters were fed diet containing 16% protein (well-nourished) or 6% protein (malnourished). From weaning to the end of behavioral tests well-nourished animals were fed a commercial lab chow diet (well-nourished--W) and the malnourished rats were divided into 2 groups: one was maintained on 6% protein diet (malnourished--M) and the other was fed a commercial lab chow diet (previously malnourished--PM). Pairs of male rats of same diet conditions were tested, at different ages, for three consecutive days. During sessions the following behaviors were recorded: pinning, wrestling, walk-over and rear. The frequency of wrestling and walk-over was significantly higher in malnourished as compared to well-nourished animals (p<0.05). Early protein malnutrition also changed the ontogeny of play behaviors (pinning and wrestling) with developmental retards in M and PM as compared with W animals, especially at 46 and 56 days of age. These results suggest that early protein malnutrition can affect the development of neural mechanisms underlying social play in rats.
