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A new in vitro method using the dialysis tubing for predicting the ileal apparent digestibility (IAD) of crude protein (CP) and amino acids (AA) was proposed for pig feedstuffs. Under the laboratory condition, the procedure of the in vitro dialysis tubing method was as follows: a 1.0g sample of feedstuff was placed in a 100ml Erlenmeyer flask, 10ml hydrochloric acid (0.01M, pH=20) pepsin solution...