Bielorai R, Tamir M, Hurwitz S
J Nutr. 1977 Oct;107(10):1775-8. doi: 10.1093/jn/107.10.1775.
Net absorption of individual amino acids along the intestinal tract was determined in chicks fed heated soybean meal (HS) and raw soybean meal (RS) using 91Y as a reference substance. In the duodenum of chicks fed either diet, the absorption of the amino acids varied. In chicks fed the RS diet, the differences were greater than in chicks fed the HS diet, and most of the values were negative. Methionine was the most rapidly absorbed amino acid. No cystine was found in the upper parts of the intestinal tract of chicks fed either diet. A linear relationship was obtained between the amino acid absorption values in the duodenum of chicks fed either diet. The differences recorded seem to be due to nitrogen secretion, which is enhanced in RS-fed chicks. The differences between individual amino acid absorption decreased gradually in the other segments and attained in the lower ileum an average cumulative value of 90% and 70% in chicks fed on HS and RS respectively. The 20% difference was probably a result of the inhibited digestion in the intestine (duodenum excluded) of chicks fed RS. The results indicate that the absorption process can proceed even when the digestion is inhibited.
以91Y作为参考物质，测定了饲喂加热豆粕（HS）和生豆粕（RS）的雏鸡肠道中各氨基酸的净吸收量。在饲喂任何一种日粮的雏鸡十二指肠中，氨基酸的吸收情况各不相同。在饲喂RS日粮的雏鸡中，差异大于饲喂HS日粮的雏鸡，且大多数值为负值。蛋氨酸是吸收最快的氨基酸。在饲喂任何一种日粮的雏鸡肠道上部均未发现胱氨酸。在饲喂任何一种日粮的雏鸡十二指肠中，氨基酸吸收值之间呈线性关系。记录到的差异似乎是由于氮分泌所致，在饲喂RS的雏鸡中氮分泌增强。在其他肠段，各氨基酸吸收之间的差异逐渐减小，在回肠下段，饲喂HS和RS的雏鸡平均累积吸收值分别达到90%和70%。20%的差异可能是由于饲喂RS的雏鸡肠道（不包括十二指肠）消化受到抑制所致。结果表明，即使消化受到抑制，吸收过程仍可进行。
