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1. The ovulation, oviposition and eating pattern of laying hens showed that the second light period in the 2L:12D:2L:8D skeleton photo‐period is interpreted as the start of the subjective day.
2. This interpretation is independent of the light period during which the animals are serviced.
3. During each of the 2L periods about one‐third of the total food is eaten, the other third is eaten during the 8D period: little or nothing is eaten during the 12D period.