Abstract
The effects of scopolamine and atropine on the open-field behavior of Production Red and White Leghorn chickens were examined in order to evaluate the suggestion that the influence of these anticholinergic drugs on tonic immobility was mediated by their impact on emotionality. Significant strain differences in vocalization latency, number of vocalizations, and activity latency were observed. Both of the anticholinergic drugs reduced the chickens’ vocalization and activity latencies, but they increased the number of vocalizations and activity levels. Intercorrelations among the various behavioral measures are presented and discussed. The effects of the two independent variables (genetic strain and anticholinergic drugs) on open-field behavior appear consistent with the interpretation that both of them influence the emotionality of subjects.
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