Abstract
Beginning at 21 days of age, rats were housed 10 per cage in a competitive environment (a large cage containing a single food and water source) or a noncompetitive environment (a large cage containing multiple food and water sources). At maturity, matched pairs of animals from within a single rearing cage were tested for shock-elicited fighting over five 100-trial sessions. In each of two experiments, animals reared in the noncompetitive environment displayed more aggressive behavior than animals reared in the competitive environment.
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