Mateos G G, Sell J L
Poult Sci. 1980 Sep;59(9):2129-35. doi: 10.3382/ps.0592129.
An experiment involving 60 Single Comb White Leghorn laying hens was conducted to measure the influence of the carbohydrate source and supplemental fat on nitrogen-corrected metabolizable energy(MEn) of the diet. Twelve diets with the same calculated metabolizable energy (ME) and protein levels were arranged in a 2 X 6 factorial composed of two different yellow grease to soy oil ratios (6%:0% and 4%:2% of the diet) and 6 corn starch to sucrose ratios (from 49%:0% to 0%:49%). The diets were assayed for MEn content by using the total feces collection method. There was a positive linear relationship between sucrose level and MEn of the diet. When sucrose replaced corn starch, the MEn of the diets increased more than expectd, and these increments were statistically significant (P < .01). The diets containing a mixture of yellow grease and soy oil had significantly higher MEn values than those in which supplemental fat was supplied exclusively as yellow grease (P < .05). A comparison of the "calculated" regression equation describing the expected dietary ME with changing sucrose and soy oil levels, Y = 3110 + 1.03 (% sucrose) + 9 (% soy oil), and the regression equation determined experimentally, Y = 3177 + 3.25 (% sucrose) + 18 (% soy oil), illustrates the relatively large increases in dietary ME caused by sucrose and soy oil. These effects of sucrose and soy oil were independent. These data support the concept that the addition of a relatively unsaturated fat (soy oil) to a saturated fat (yellow grease) enhances dietary MEn. Also, the data indicate that the presence of supplemental fat in the diet increases the utilization of energy from sucrose. Thus, the "extra-caloric" effect of fats on MEn may be the culmination of a favorable interaction between supplemental fats and fats inherent in other diet components, and a beneficial influence of supplemental fats on energy utilization from certain nonlipid dietary constituents.
进行了一项涉及60只单冠白来航母鸡的实验，以测定碳水化合物来源和补充脂肪对日粮氮校正代谢能（MEn）的影响。将12种具有相同计算代谢能（ME）和蛋白质水平的日粮按2×6析因设计排列，其中包括两种不同的黄油脂与豆油比例（日粮的6%:0%和4%:2%）以及6种玉米淀粉与蔗糖比例（从49%:0%到0%:49%）。采用全粪收集法测定日粮的MEn含量。蔗糖水平与日粮的MEn之间存在正线性关系。当蔗糖替代玉米淀粉时，日粮的MEn增加幅度超过预期，且这些增加具有统计学显著性（P < 0.01）。含有黄油脂和豆油混合物的日粮的MEn值显著高于仅以黄油脂作为补充脂肪的日粮（P < 0.05）。将描述预期日粮ME随蔗糖和豆油水平变化的“计算”回归方程Y = 3110 + 1.03（%蔗糖）+ 9（%豆油）与实验确定的回归方程Y = 3177 + 3.25（%蔗糖）+ 18（%豆油）进行比较，表明蔗糖和豆油导致日粮ME相对大幅增加。蔗糖和豆油的这些作用是独立的。这些数据支持了以下概念：在饱和脂肪（黄油脂）中添加相对不饱和脂肪（豆油）可提高日粮的MEn。此外，数据表明日粮中补充脂肪的存在增加了蔗糖能量的利用率。因此，脂肪对MEn的“额外热量”效应可能是补充脂肪与其他日粮成分中固有脂肪之间有利相互作用的结果，以及补充脂肪对某些非脂质日粮成分能量利用的有益影响。
