All data are expressed as mean with SEM. Body weight was analyzed by a repeated-measures three-way ANOVA. The number of center zone entries and total distance in the OFT, the total duration of immobility in the FST, and free amino acid concentrations were analyzed using three-way ANOVA; significance was set at p < 0.05. Multiple regression analysis was applied to the OFT and FST for the variables of parental strain and sex of pups (strain: WIS rat =1, WKY rat = 2, sex: male =1, female = 2). All analyses were performed with StatView (version 5, SAS Institute Cary, USA, SAS, 1998). Outlying data from the behavioral tests and amino acid analysis were eliminated using Thompson’s test criterion for outlying observations (p < 0.01). Although several combinations of interactions were determined, only interactions indicating significant effects are provided in the relevant tables and figures.
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