回─直肠吻合猪的排泄规律对内源氨基酸校正的影响

为了探讨猪内源氨基酸的估测方法，本试验研究了饲喂粗纤维含量分别为：２．０％、５．０％和８．０％的３种纯合无氮日粮时，荷术猪每天回肠末端干物质排泄量和排泄物中氨基酸含量的变化规律。结果指出：（１）饲喂不同纯合无氮日粮时，荷术猪各天回肠末端干物质排泄量变异系数（Ｃ．Ｖ％）随日粮粗纤维含量的增加而减小：（２）从各组荷术猪回肠末端干物质排泄量变化规律看，至少需３头试验猪，经预饲３天后，再收集３天食糜才能保证排泄物样品的代表性；（３）回肠末端排泄物中氨基酸含量随着无氮日粮饲喂期的延长呈稳定到锐减的趋势型，因此用无氮日粮法进行内源氨基酸校正时，排泄物采样时间不宜过长。

EFFECT OF THE REGULARITY OF EXCRETION FLOW ON THE EVALUAION OF ENDOGENOUS AMINO ACID IN ILEO-RECTAL ANASTOMOSISED SWINE

This study explored the change of dry matter and the change of content of aminoacid in excreta of 3 ileo-rectal anastomosised swine fed 3 purified nitrogen-free dietscontained 2.0%,5.0%,8.0% crude fibre respectively.The result showed that(1)thevariance coefficient(C.V%)of dry matter in excreta each day decreased with theincrease of the crude fibre content in purified nitrogen-free diets;(2)according to the variation of the quantity of dry matter of excreta,followed a three-days' periodpretest a three or four-days'period collection was proper for meeting the precisionrequirement of sample of excreta;(3) the content of amino acid, especially the noneessentional amino acid in excreta decreased with the extension of the days of feedingnitrogen-free diet.So,the sampling period of excreta for endogenous amino acid corre-ction should not be too long.