Summers J D, Spratt D, Atkinson J L
Department of Animal and Poultry Science, University of Guelph, Ontario, Canada.
Poult Sci. 1992 Feb;71(2):263-73. doi: 10.3382/ps.0710263.
Three experiments were conducted with broiler chicks where diet composition varied with respect to dietary protein, energy, and essential amino acid (EAA) balance. Birds fed diets varying widely in EAA balance and protein and energy levels performed differently with respect to percentage carcass fat and protein. The absolute carcass protein deposition remained relatively constant between treatments, but body fat content varied depending on level of energy intake. Although abdominal fat content varied with level of dietary protein and energy, these values did not correlate well with total carcass fat deposition. Carcass fat deposition correlated well with dietary energy intake, which in turn appeared to be influenced by birds eating to satisfy their EAA requirement. With diets of similar EAA balance, birds appeared to have similar EAA intakes rather than similar energy intakes. Birds fed diets with similar EAA levels, but varying widely in level of nonessential amino acids, energy, or both consumed similar amounts of feed and deposited similar amounts of carcass protein. The present data suggest that level and balance of EAA can have a significant effect on feed intake, thereby influencing weight gain and carcass composition.
用肉鸡进行了三项试验，其中日粮组成在蛋白质、能量和必需氨基酸（EAA）平衡方面存在差异。饲喂EAA平衡、蛋白质和能量水平差异很大的日粮的鸡，在胴体脂肪和蛋白质百分比方面表现不同。各处理间胴体蛋白质的绝对沉积量相对保持恒定，但体脂含量因能量摄入量而异。虽然腹部脂肪含量随日粮蛋白质和能量水平而变化，但这些值与胴体总脂肪沉积的相关性并不好。胴体脂肪沉积与日粮能量摄入量密切相关，而日粮能量摄入量似乎又受鸡为满足其EAA需求而采食的影响。在EAA平衡相似的日粮中，鸡的EAA摄入量似乎相似，而不是能量摄入量相似。饲喂EAA水平相似但非必需氨基酸水平、能量水平或两者差异很大的日粮的鸡，消耗的饲料量相似，胴体蛋白质沉积量也相似。目前的数据表明，EAA的水平和平衡对采食量有显著影响，从而影响体重增加和胴体组成。
