Recently, attention has been brought to the welfare of laying hens and the benefits provided by progressive housing systems [3]. Conventional battery cage (CC) systems provide each bird with access to feed and water at all times with room to move. One of the new housing types being implemented, referred to as a cage-free aviary system (AV), is much larger than conventional cages and houses more birds. Aviary systems comprise multiple levels providing more opportunity for movement and exercise. Hens can forage and dust bathe in an open communal area, have access to perches, and nest boxes. However, for mature hens to fully utilize an AV, pullets (pre-egg production birds) must be reared in a similar environment.

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