Abstract
Research has demonstrated substantial strain differences among chickens in the duration of tonic immobility. The present study was designed to compare the habituation of immobility in White Leghorn and Production Red chickens. Experiment 1 replicated other research by showing that (a) repeated elicitation of immobility, and not just handling, was responsible for reduced response durations for both strains; and (b) White Leghorns displayed significantly longer response durations compared to Production Reds. Retention of habituation of immobility in White Leghorns was explored in a second experiment and was found to replicate the lack of spontaneous recovery noted in other research with Production Reds.
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