Perez-Maldonado R A, Norton B W
Department of Agriculture, University of Queensland, Brisbane, Australia.
Br J Nutr. 1996 Oct;76(4):501-13. doi: 10.1079/bjn19960059.
An experiment was conducted to investigate the metabolism of condensed tannin (CT) in sheep and goats offered a mixture of Digitaria decumbens (700 g/kg) and Desmodium intortum (300 g/kg) hay. Radioactive 14CO2 was used to label CT in young growing desmodium plants, [14C]CT was extracted, purified and infused intraruminally, and the metabolism of [14C]CT was followed in the rumen and lower digestive tract of both species. Digestion of DM, organic matter (OM), cell-wall constituents (CWC), N and the efficiency of rumen microbial synthesis were determined using a continuous intraruminal infusion of 51Cr EDTA, YbCl3 and Na235SO4. The measurements taken for sheep and goats respectively were: intake, 21 and 30 g/kg0.9 per d; digestibilities (g/g) of DM, 0.566 and 0.505; OM 0.578 and 0.508; neutral-detergent fibre, 0.584 and 0.532; and acid-detergent fibre, 0.535 and 0.435. None of these measurements was significantly different (P > 0.05) between animal species. There was an apparent net gain in lignin across the rumen and whole intestinal tract for both animal species (19 and 29% for sheep and goats respectively). There were no significant differences between sheep and goats (P > 0.05) detected for any measurements of N excretion and utilization. The overall efficiency of N digestion and utilization was also similar between species. The routes of CT metabolism were compared for both colorimetric estimates (butanol-HCl) of dietary CT (DCT) and the specific radioactivity of [14C]CT in digesta (abomasum) and excreta (urine and faeces) of both sheep and goats. [14C]CT showed total losses of 57 and 56% in sheep and goats respectively whilst losses of DCT of 71 and 70% were detected with butanol-HCl in sheep and goats respectively. The apparent losses of DCT across the rumen of sheep and goats were 12 and 9% whilst higher losses (49 and 42% for sheep and goats respectively) were observed for [14C]CT. Losses of DCT in the lower intestinal tract accounted for 69 and 71% of the total CT leaving the abomasum. By comparison, only 40 and 35% of [14C]CT was lost during intestinal passage in sheep and goats respectively. It was concluded that the infused free [14C]CT interacted with DCT and entered the protein and fibre-bound DCT pools. The loss of DCT during passage through the intestines was considered to be a consequence of either absorption of free CT or the degradation products of CT. It was assumed that free CT arose in the lower gastrointestinal tract from protein-CT and fibre-CT dissociation to be digested and/or absorbed. The higher recoveries of [14C]CT in faeces (32 and 35%) compared with DCT (27 and 26%) for sheep and goats respectively) were associated with the excretion of [14C] degradation products or conjugates which were not reactive to butanol-HCl. It was concluded that both methods (butanol-HCl and labelling CT with 14C) detected a substantial disappearance of CT (free, protein, and fibre-bound) during metabolism in the gastrointestinal tract in sheep and goats.
进行了一项实验，以研究给绵羊和山羊饲喂俯仰马唐（700克/千克）和扭曲山蚂蝗（300克/千克）混合干草时缩合单宁（CT）的代谢情况。使用放射性14CO2标记幼嫩生长的山蚂蝗植株中的CT，提取、纯化[14C]CT并瘤胃内灌注，然后在这两个物种的瘤胃和下消化道中追踪[14C]CT的代谢。使用51Cr EDTA、YbCl3和Na235SO4连续瘤胃内灌注来测定干物质（DM）、有机物（OM）、细胞壁成分（CWC）、氮的消化率以及瘤胃微生物合成效率。绵羊和山羊的测量值分别为：采食量，每天21和30克/千克0.9；DM消化率（克/克），0.566和0.505；OM，0.578和0.508；中性洗涤纤维，0.584和0.532；酸性洗涤纤维，0.535和0.435。这些测量值在两个动物物种之间均无显著差异（P>0.05）。两个动物物种在瘤胃和整个肠道中木质素均有明显净增加（绵羊和山羊分别为19%和29%）。在氮排泄和利用的任何测量中，绵羊和山羊之间均未检测到显著差异（P>0.05）。两个物种之间氮消化和利用的总体效率也相似。比较了绵羊和山羊日粮CT（DCT）的比色法估计值（正丁醇 - 盐酸）以及瘤胃内容物（皱胃）和排泄物（尿液和粪便）中[14C]CT的比放射性的CT代谢途径。[14C]CT在绵羊和山羊中的总损失分别为5
