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- W1997562225 abstract "1. Brown-egg pullets were reared on 8-h photoperiods and temporarily transferred at 80 d of age to 14-h photoperiods for 2, 4, 6, 8, 10 or 12 d. Controls were either maintained on 8 h or permanently transferred to 14 h at 80 d.2. Pullets given 8 or 12 long days matured 8–9 d earlier than constant 8-h controls, but 22–23 d later than pullets transferred permanently to long days. Mean age at first egg for the groups given 2, 4, 6 or 10 d of 14-h days were not significantly different from the 8-h controls. The mean weight of first egg and body weight at first egg for the temporarily-photostimulated groups were not significantly different from constant 8-h controls, but egg weights were ≥5·1 g and body weights at first egg ≥200 g heavier than the birds transferred permanently to 14 h.3. It is concluded that up to 6 temporary long days may be given (from 80 d of age) without affecting the timing of sexual maturity, but that the provision of 8 or more long days will accelerate sexual development, though not to the extent of a permanent transfer, in most birds within a flock. A regression analysis of the ages at which the first and last birds in the groups given 6, 8, 10 or 12 long days matured suggested that about 20 d of photostimulation are required to achieve a mean age at first egg similar to that of birds permanently transferred to long days." @default.
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- W1997562225 date "2006-12-01" @default.
- W1997562225 modified "2023-10-17" @default.
- W1997562225 title "Effect of temporary transfers to 14 h on age at first egg in domestic pullets reared on 8-h photoperiods" @default.
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- W1997562225 doi "https://doi.org/10.1080/00071660601042406" @default.
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