Abstract
An intermittent lighting regime 3L:3D (4x) was compared in two experiments with a conventional lighting regime (15L:9D or 17L:7D) in terms of bone strength in laying hens. Bone strength was assessed from the breaking strength of the humerus and tibia. In one of the comparisons, tibia strength at the end of lay was lower in the 3L:3D (4x) birds. In the second comparison, birds in the 3L:3D (4x) treatment failed to show an increase in bone strength during lay. The intermittent lighting regime offered no advantage over conventional lighting as a means of improving bone strength in hens.
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