Edwards D G, Porter P D, Dean J
Lab Anim. 1985 Oct;19(4):328-35. doi: 10.1258/002367785780887392.
Male and female weanling rats were fed ad libitum for 28 days on purified diets with metabolizable energy levels of 8.0, 9.5, 11.0 or 12.5 MJ/kg and protein:energy ratios of 1:1, 1.33:1, 1.67:1 or 2:1 %:MJ/kg at each energy level. Major nutrients were balanced in proportion to energy and protein. The following parameters were measured: food intake, bodyweight, body length, abdominal fat, liver and kidney weights. Increasing dietary energy level reduced food intake but the reduction was not sufficient to prevent an increase in energy intake. This was reflected by increases in bodyweight, body length, abdominal fat, and relative liver and kidney weights, especially in male rats. Higher energy intake increased weight gain and food conversion efficiency to a greater extent than higher protein intake. The response to protein intake at different energy levels was not consistent. There was no common protein:energy ratio for overall good performance. It is concluded that rat growth and other features can be controlled by the alteration of dietary energy and protein levels.
将雄性和雌性断奶大鼠随意喂食28天，饲料为纯化日粮，代谢能水平分别为8.0、9.5、11.0或12.5兆焦/千克，且在每个能量水平下蛋白质与能量的比例分别为1:1、1.33:1、1.67:1或2:1（%:兆焦/千克）。主要营养素按能量和蛋白质的比例保持平衡。测量了以下参数：食物摄入量、体重、体长、腹部脂肪、肝脏和肾脏重量。提高日粮能量水平会降低食物摄入量，但这种降低不足以防止能量摄入量增加。这表现为体重、体长、腹部脂肪以及相对肝脏和肾脏重量增加，在雄性大鼠中尤为明显。较高的能量摄入量比较高的蛋白质摄入量在更大程度上增加了体重增加和食物转化效率。在不同能量水平下对蛋白质摄入量的反应并不一致。不存在一个普遍适用于整体良好生长性能的蛋白质与能量比例。结论是，大鼠的生长和其他特征可通过改变日粮能量和蛋白质水平来控制。
