THE COMPARISON OF ILEAL DIGESTIBILITY OF PROTEIN AND AMINO ACIDS IN GM RICE AND PARENTAL RICE

Objective: To compare the digestibility of protein and amino acids in parental rice and rice genetically modified with cowpeas trypsin inhibitor. Methods: Six experimental swine were surgically fitted with simple T-cannula at the terminal ileum, and fed with parental rice and rice genetically modified with cowpeas trypsin inhibitor alternately. The ileum digesta were collected for determination of apparent and true digestibility of protein and amino acids. Results: The apparent and true digestibility of protein is similar in these two types of rice. Except the apparent digestibility of lysine, there are no statistical significances in the apparent and true digestibility of other 17 amino acids. Conclusion: The digestibility of amino acids is not changed by the insert of foreign gene, so it can meet the request of "substantial equivalence" in protein and amino acids digestibility.