The effect of feeding 0, 4, 8 and 16% rapeseed oil from 12–42 days of age was studied in broiler chickens on performance, digestibility of nutrients, and development of gastrointestinal tract, protein and energy metabolism. Thirty six female chickens (Ross 208) with initial body weight average 246 g were allocated to the four groups and kept pair-wise in metabolism cages. The chickens were fed similar amounts of metabolisable energy (ME) per day and similar amounts of essential amino acids relative to ME by adjusting with crystalline amino acids. The chickens were subjected to four balance periods each of five days with two 24 h measurements of gas exchange in two open-air-circuit respiration chambers inserted on the second and third day of each period. The addition of rapeseed oil increased the amount of gutfill indicating a reduced rate of passage and causing a hypertrophy of the gastrointestinal tract. There was a positive effect on feed utilisation as well as on digestibility especially of dietary fat together with higher utilisation of protein with addition of rapeseed oil. The partial fat digestibility of rapeseed oil estimated by regression was 91.1% and the partial metabolisability (ME/GE) of the rapeseed oil was estimated to 85% yielding an apparent metabolisable energy value of 34.30 MJ/kg.

中文翻译：

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等氮日粮中菜籽油分级水平对肉鸡胃肠道发育及蛋白质、脂肪和能量利用的影响

研究了从 12-42 日龄饲喂 0%、4%、8% 和 16% 菜籽油对肉鸡生产性能、营养物质消化率以及胃肠道发育、蛋白质和能量代谢的影响。将初始体重平均为 246 克的 36 只雌性鸡 (Ross 208) 分配到四组，并在代谢笼中成对饲养。通过用结晶氨基酸进行调整，鸡每天喂食相似量的代谢能 (ME) 和与 ME 相似量的必需氨基酸。鸡经历四个平衡期，每五天，在每个周期的第二天和第三天插入两个开放式呼吸室中进行两次 24 小时的气体交换测量。菜籽油的添加增加了填充物的量，表明通过率降低并导致胃肠道肥大。添加菜籽油对饲料利用率以及消化率，尤其是膳食脂肪的消化率都有积极影响，同时蛋白质的利用率更高。通过回归估计菜籽油的部分脂肪消化率为 91.1%，菜籽油的部分代谢率 (ME/GE) 估计为 85%，产生的表观代谢能值为 34.30 MJ/kg。