(*) as of 5% lay, 1 hr 30 min of night lighting may be added if necessary,
(1) For white-egg layer breeders: a day-length longer than 15 hr is not necessary,
(2) For brown-egg layer breeders: a minimum day-length of 16 hr is recommended
to reduce floor eggs
Lighting programme in semi-dark (brown-out) or open-sided houses
Complete control of sexual maturity is difficult to achieve in this type of buildings since the seasonal
fluctuations of day length still interfere with sexual development. Sexual maturity usually observed in
the flocks coming from this rearing house at the same season has to be taken into account.