How young chickens play can indicate how they feel SciReports
. Commercial hatching may therefore serve as a realistic model for early stress. Given that play is considered to be associated with states of good welfare, we hypothesized that commercially hatched chicks would show a reduced frequency of play throughout ontogeny.
At 23 days of age, all birds were moved to larger pens measuring 0.7 × 2.1 m, supplied with wood chips, a heat lamp, perches, feed, and water. From this point on, all birds within each category were housed together . The pens were further expanded to 0.7 × 2.8 m on day 42 to accommodate for the growth of the birds. The animals were kept on a 12:12 h dark:light schedule throughout the experiment.
It has been shown that play in chicks is stimulated by increased access to space and objects to play with. Therefore, the tests were carried out in separate, fully enclosed arenas that were considerably larger than the home pens , containing wood chips, a perch along one short end, a small pile of hay, and a hanging chain. As the arenas were completely enclosed, there were no visual stimuli from outside the arena.
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