Cognitive bias and anticipatory behaviour of laying hens housed in basic and enriched pens

摘要: Abstract The performances of adult laying hens, housed in either a basic or an enriched pen, were investigated cognitive bias and anticipation test. Both tests designed to measure the assumed emotional state birds. behaviour birds each test was compared see whether both provided similar evidence changed state. In addition, measures fear negative social interactions within home pen taken, their association with examined. No significant differences between treatments found, which suggests that pens did not induce large enough birds’ have impact on tests. On other hand, number exhibited correlated some aspects amount training needed reach testing criteria latencies approach near rewarded probe same This when animals are put under more severe treatment differences, individual greater how they perform