The Energy Requirements of Broiler Breeders During the Pullet-Layer Transition Period

摘要: Abstract The purpose of this study was to evaluate the energy requirements broiler breeders during their pullet-layer transition period, based on actual production individual birds rather than flock averages. Individual laying records were established in two preliminary trials with housed battery cages, and effects higher usual daily allocations, starting at various ages, determined floor-pen trials. rise average egg a basis parallels increase proportion flock, while rate among layers only is uniform (approximately 80%) from beginning period. best performance obtained when provided allowance 440 kcal/bird/day 2 3 weeks before start production. traditional regimen slow, gradual increases feed allocation rising resulted worst performance. Egg size responded more readily increased allowances did Suboptimal supply up levels 55% or even 30% cannot be corrected by providing adequate excessive allocations after these stages.