Batterham E S, Andersen L M, Baigent D R
NSW Agriculture, Wollongbar Agricultural Institute, New South Wales, Australia.
Br J Nutr. 1993 Nov;70(3):711-20. doi: 10.1079/bjn19930166.
An experiment was conducted to determine the utilization of ileal digestible methionine by growing pigs. Three methionine-deficient diets (0.09 g ileal digestible methionine/MJ digestible energy (DE)) were formulated using cottonseed meal, meat-and-bone meal and soya-bean meal respectively as the only source of methionine in the diet. An additional three diets were formulated with supplements of methionine to confirm that methionine was limiting in the first three diets. The growth performance and retention of methionine by pigs given the six diets over the 20-45 kg growth phase was then determined. Growth rates (g/d) of pigs given the three diets formulated to 0.09 g ileal digestible methionine/MJ DE were significantly different (P < 0.01): cottonseed meal 411, meat-and-bone meal 442, soya-bean meal 496 (SED 24.6). The response of pigs to the addition of methionine confirmed that methionine was limiting in these diets. Crude protein (N x 6.25) deposited by the pigs (g/d) was significantly higher (P < 0.05) for those given soya-bean meal (61) and meat-and-bone meal (57) relative to cottonseed meal (47; SED 3.3). The proportion of ileal digestible methionine retained by pigs given the three protein concentrates was: cottonseed meal 0.39, meat-and-bone meal 0.45, soya-bean meal 0.47 (SED 0.019). These results indicate that values for the ileal digestibility of methionine in protein concentrates do not reflect the proportion of methionine that can be utilized by the pig. It appears that, with heat-processed meals, a considerable proportion of the methionine is absorbed in a form(s) that is (are) inefficiently utilized.
进行了一项试验，以测定生长猪对回肠可消化蛋氨酸的利用率。分别以棉籽粕、肉骨粉和豆粕作为日粮中蛋氨酸的唯一来源，配制了三种蛋氨酸缺乏日粮（0.09克回肠可消化蛋氨酸/兆焦可消化能量（DE））。另外配制了三种添加蛋氨酸的日粮，以证实前三种日粮中蛋氨酸是限制性的。随后测定了猪在20 - 45千克生长阶段采食这六种日粮时的生长性能和蛋氨酸保留率。采食按0.09克回肠可消化蛋氨酸/兆焦DE配制的三种日粮的猪的生长速率（克/天）差异显著（P < 0.01）：棉籽粕组411，肉骨粉组442，豆粕组496（标准误24.6）。猪对添加蛋氨酸的反应证实了这些日粮中蛋氨酸是限制性的。相对于棉籽粕组（47；标准误3.3），采食豆粕（61）和肉骨粉（57）的猪沉积的粗蛋白（氮×6.25）（克/天）显著更高（P < 0.05）。采食三种蛋白质浓缩物的猪保留的回肠可消化蛋氨酸比例为：棉籽粕0.39，肉骨粉0.45，豆粕0.47（标准误0.019）。这些结果表明，蛋白质浓缩物中蛋氨酸的回肠消化率值并不能反映猪可利用的蛋氨酸比例。看来，对于经过热处理的饲料，相当一部分蛋氨酸是以低效利用的形式被吸收的。
