Turro-Vincent I, Nitsan Z, Picard M, Dunnington E A, Siegel P B
INRA, Station de Recherches Avicoles, Centre de Tours-Nouzilly, France.
Reprod Nutr Dev. 1994;34(5):449-60. doi: 10.1051/rnd:19940506.
The effect of residual yolk removal at hatch on growth and feeding behavior was assessed in lines of chickens divergently selected for low (LW) or high (HW) 56-day body weight. At hatch chicks were assigned to 1 treatment: removal of the residual yolk (R) or no surgery (I). Twenty-four chicks per line (12 I and 12 R) were assigned to an all-mash regimen (M) and 48 per line (24 I and 24 R) to a choice (C) between mash and dietary residual yolk. HW were heavier than LW chicks regardless of treatment. On day 5 and thereafter, chicks given a choice were heavier than those eating mash. HW chicks ate more than LW ones. The percentage of yolk eaten increased during the 2-3 d after hatch, remained constant for 2 d, then decreased. Results are discussed in term of yolk need and development of the gastrointestinal tract in the divergent lines.
在对56日龄体重进行低（LW）或高（HW）方向选育的品系鸡中，评估了孵化时去除残留卵黄对生长和采食行为的影响。在孵化时，雏鸡被分配到1种处理：去除残留卵黄（R）或不进行手术（I）。每个品系24只雏鸡（12只I和12只R）被分配到全粉料饲养方案（M），每个品系48只雏鸡（24只I和24只R）可在粉料和日粮残留卵黄之间进行选择（C）。无论处理如何，HW雏鸡都比LW雏鸡重。在第5天及之后，有选择机会的雏鸡比吃粉料的雏鸡重。HW雏鸡比LW雏鸡吃得更多。孵化后2 - 3天内，吃掉的卵黄百分比增加，保持2天不变，然后下降。根据不同品系中对卵黄的需求和胃肠道的发育情况对结果进行了讨论。
