Robertson J A, Murison S D, Chesson A
J Nutr. 1987 Aug;117(8):1402-9. doi: 10.1093/jn/117.8.1402.
Potential digestibility and rate of degradation of water-insoluble material (WIM) prepared from rutabaga, wheat bran and digesta recovered from the terminal ileum of pigs fed bran- or rutabaga-based diets were measured in the cecum of surgically modified pigs. WIM samples recovered from the cecum after fixed incubation times were analyzed and the rate of total disappearance of organic matter, cellulose, uronic acid and noncellulosic neutral sugars was calculated. Maximum degradation of each WIM occurred within 48 h after incubation and was for rutabaga and its ileal digesta 90 and 70%, respectively, and for bran and bran ileal digesta 55 and 45%, respectively. Cellulose and uronic acid in bran samples did not appear to be degraded, material disappearance being attributable to the loss of noncellulosic neutral sugars. Estimation of potential organic matter digestibility showed rutabaga to be 93%, rutabaga digesta 79%, bran 56% and bran digesta 43% digestible. Fractional rates of digestion in rutabaga samples were significantly faster than in corresponding bran samples. When related to the role of fiber in nutrition the results obtained suggest that cereal fiber would be only slightly modified during gut transit, unlike vegetable fiber in which microbial digestion would probably result in the total destruction of the fiber cell wall matrix.
在经过手术改造的猪的盲肠中，测定了用芜菁、麦麸以及以麸皮或芜菁为基础日粮饲养的猪回肠末端回收的食糜制备的水不溶性物质（WIM）的潜在消化率和降解速率。分析了在固定培养时间后从盲肠回收的WIM样品，并计算了有机物、纤维素、糖醛酸和非纤维素中性糖的总消失率。每种WIM在培养后48小时内出现最大降解，芜菁及其回肠食糜的最大降解率分别为90%和70%，麸皮及其回肠食糜的最大降解率分别为55%和45%。麸皮样品中的纤维素和糖醛酸似乎未被降解，物质消失归因于非纤维素中性糖的损失。潜在有机物消化率的估计表明，芜菁的可消化率为93%，芜菁食糜为79%，麸皮为56%，麸皮食糜为43%。芜菁样品的消化分数率明显快于相应的麸皮样品。当与纤维在营养中的作用相关时，所得结果表明，谷物纤维在肠道转运过程中只会发生轻微改变，这与蔬菜纤维不同，蔬菜纤维中的微生物消化可能会导致纤维细胞壁基质的完全破坏。
