Abstract
1. 1. Aggressive behavior and whole brain neurochemistry were measured in stable and unstable pairs of male Coturnix coturnix japonica. 2. 2. Aggressive pecking peaked on day 5 of the daily regrouping regime and returned to a basal level on day 14. 3. 3. Aggressive behavior was associated with increased brain norepinephrine (NE), dopamine (DA), and acetylcholinesterase (AChE) in unstable pairs. 4. 4. Habituation (12–15 days) and DA response to daily regrouping and inanition were inversely related in unstable and stable pairs respectively. 5. 5. Normal whole brain NE increases were attenuated in unstable pairs.
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