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Moderate Prenatal Alcohol Exposure and Quantification of Social Behavior in Adult Rats
Published on: December 14, 2014
Prenatal protein malnutrition affects the social interactions of juvenile rats
S S Almeida1, J Tonkiss, J R Galler
1Laboratório de Nutrição e Comportamento, Universidade de São Paulo, Ribeirão Preto, Brasil.
Insights
Prenatal protein malnutrition in rats significantly reduced juvenile social behaviors, including playful and nonplayful interactions. This early life nutritional stress also increased nonsocial behaviors, impacting social development.
Area of Science:
- Neuroscience
- Developmental Psychology
- Animal Behavior
Background:
- Prenatal nutrition is crucial for offspring development.
- Protein malnutrition during gestation can impact neurodevelopment.
- Early life experiences shape social behavior.
Purpose of the Study:
- To investigate the effects of prenatal protein malnutrition on juvenile social behavior in rats.
- To determine if malnutrition impacts playful and nonplayful social interactions.
- To assess potential gender differences in response to prenatal malnutrition.
Main Methods:
- Rats received either a control (25% protein) or low-protein (6% protein) diet during pregnancy.
- Pups were fostered to control mothers and weaned at 21 days.
- Social behavior was assessed at 45 days by pairing malnourished and control rats of the same gender.
- Playful, nonplayful social, and nonsocial behaviors were recorded during 10-minute sessions.
Main Results:
- Prenatal protein malnutrition significantly decreased playful social behaviors (e.g., pinning).
- Nonplayful social behaviors (e.g., anogenital sniffing, grooming) were also significantly reduced.
- Nonsocial rearing behavior was significantly increased in malnourished rats.
- No significant gender differences in social behavior alterations were observed.
Conclusions:
- Prenatal protein malnutrition has lasting detrimental effects on juvenile social behavior in rats.
- Altered social behavior in early life may contribute to later behavioral differences in adulthood.
- This study highlights the critical role of maternal nutrition in shaping offspring social development.
Abstract:
The effects of prenatal protein malnutrition on juvenile social behavior was investigated in male and female rats. Animals were provided with 25% (control) or 6% (low protein) casein diets before and during pregnancy. After birth eight pups in each litter (six males and two females) were fostered to lactating control mothers. After weaning (21 days of age) all animals received a lab chow diet until behavioral testing began at 45 days of age. To assess social interaction, pairs of rats of the same gender, consisting of one malnourished and one control rat, were placed in a familiar rectangular arena on 3 consecutive days. Playful social behavior (pin), nonplayful social behaviors (anogenital sniff, walk-over, side-mount, and allogroom), and nonsocial behavior (rear) were recorded in 10-min sessions. Prenatal malnutrition significantly decreased both playful and nonplayful social behaviors, and increased nonsocial rearing. No significant gender differences were observed. The finding that early social behavior is altered by prenatal malnutrition opens the possibility that such changes may play an important role in determining some of the later behavioral differences described in the adult animal.
