半体内法研究DL-蛋氨酸和过瘤胃蛋氨酸的稳定性

选择带有瘤胃、十二指肠前端和回肠末端瘘管、体况良好的 4头肉牛 ,通过小尼龙袋法 ,研究DL Met、吸附MHA、动物油包被Met和脂肪酸包被Met在瘤胃和肠道中的消失率和利用率。结果表明 ,DL Met在瘤胃中 4h便完全消失 ,不宜直接饲喂反刍动物 ;吸附MHA和动物油包被Met稳定性最好 ,脂肪酸包被Met次之 ;几种形式Met在瘤胃、瘤胃后、小肠、大肠和总消化道中的消失率以及蛋氨酸在肠道的利用率差异不显著 (P >0 .0 5 )。

Study on the Stability of DL-Methionine and By-pass Methionine by an in situ Experiment

steers fitted with fistula in the rumen, the proximal duodenum and dismal ileum were used to study the disappearance rate in rumen, postrumen, small intestine, large intestine, whole gastrointestinal tract and utilization rate in the gastrointestinal tract of DL-Met, adsorptive-MHA (A-MHA), grease-embedded-Met (G-Met) and fatty-acid-embedded-Met (FA-Met) by in situ experiment. The results indicated that DL-Met disappeared completely after 4 h incubation in the rumen.The stability of FA-Met was better than that of DL-Met. A-MHA and G-Met were better than FA-Met.The disappearance rate in rumen, postrumen, small intestine, large intestine, whole gastrointestinal tract of G-Met was the highest among these products, and so was the utilization rate in the gastrointestinal tract of G-Met.