Light intensity, intermittent lighting and feeding regimen during rearing as affecting egg production and egg quality

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Abstract
1. Four light treatments and two rearing regimens were imposed on 4 breeds of laying hen, using 6144 birds in an 8‐room climate house. 2. Room treatments were a standard lighting pattern with intensities of 0.5, 2 and 15 lux and an intermittent pattern (3 h light: 3 h dark) at 15 lux. Within room treatments were ad libitum or rationed feeding during rearing and 4 breeds: ISA Brown, Hisex Brown, Shaver Brown and Hisex White. 3. Rationing during rearing, by holding intake at its 6‐week level from 6 to 14 weeks of age, was associated with significantly higher egg production and lower egg weight, but no effect on food intake, or egg output. 4. Intermittent lighting, using a repeated 3L:3D regimen was associated with higher egg weight, but a lower rate of lay, food intake, and total egg output. 5. The absence of a consistent response to light intensity, over the range 0.75 to 12.4 lux was in contrast with earlier work, and it is possible that modern prolific hybrids are more tolerant of low intensity than were earlier stocks. 6. Despite this result it is suggested that current recommendations of 10 to 20 lux in laying houses need not be changed, because such intensities are advisable on the grounds of welfare, staff working conditions and aesthetics.