Muztar A J, Slinger S J
Poult Sci. 1981 Mar;60(3):598-602. doi: 10.3382/ps.0600598.
Samples of 35 diets were obtained from five different regions of Canada. The true metabolizable energy (TME) of these diets was measured with mature White Leghorn cockerels. The N-corrected apparent metabolizable energy (MEn) values, calculated from average analysis figures, were supplied by the feed manufacturers. The relationship between TME and MEn was examined in two ways. First, the MEn values were multiplied by 1.097, the factor to convert MEn to TME derived by Sibbald (1977), and the results were compared with the corresponding determined TME values. The percent difference between the estimated and determined TME values were for Alberta from -7.1 to 3.1; for Manitoba from -9.8 to 5.4; for the Maritimes for -.3 to 10.8; for Ontario from -3.9 to 14.7, and for Saskatchewan from -4.2 to 5.7. Second, the ratio of determined TME:MEn for the various diets was calculated. The ratios varied considerably both within a region and between regions, ranging for Alberta from 1.063 to 1.176; for Manitoba from 1.041 to 1.204; for the Maritimes for .990 to 1.102; for Ontario from .957 to 1.141, and for Saskatchewan from 1.036 to 1.144. These data suggest that the TME assay could not be used to accurately monitor the MEn content of diets in commercial practice. However, this may have been due to imprecision in the TME data or in the MEn values or both.
从加拿大五个不同地区获取了35种日粮样本。用成年白来航公鸡测定了这些日粮的真代谢能（TME）。饲料生产商提供了根据平均分析数据计算得出的氮校正表观代谢能（MEn）值。通过两种方式研究了TME与MEn之间的关系。首先，将MEn值乘以1.097（Sibbald于1977年得出的将MEn转换为TME的系数），然后将结果与相应的测定TME值进行比较。艾伯塔省估计的TME值与测定的TME值之间的百分比差异为-7.1至3.1；马尼托巴省为-9.8至5.4；滨海诸省为-0.3至10.8；安大略省为-3.9至14.7；萨斯喀彻温省为-4.2至5.7。其次，计算了各种日粮的测定TME与MEn的比值。该比值在一个地区内和不同地区之间差异很大，艾伯塔省的比值范围为1.063至1.176；马尼托巴省为1.041至1.204；滨海诸省为0.990至1.102；安大略省为0.957至1.141；萨斯喀彻温省为1.036至1.144。这些数据表明，在商业实践中，TME测定法无法准确监测日粮的MEn含量。然而，这可能是由于TME数据或MEn值或两者都不准确所致。
