Fiber composition and forage digestibility by small ruminants
Fiber composition and forage digestibility by small ruminants
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小型反刍动物的纤维成分和饲料消化率
DOI：
10.2307/3800724
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发表时间：
1974
影响因子：
2.3
通讯作者：
C. Segelquist
中科院分区：
文献类型：
--
作者：
H. L. Short;R. Blair;C. Segelquist
细胞壁成分（CWC）通常更丰富的草比其他牧草在可比的物候期。酸性洗涤剂木质素（ADL）往往是一个更大的比例酸性洗涤剂纤维（ADF）的浏览叶比其他牧草。杂类草和木质枝的CWC和ADL/ADF值通常介于两者之间。随着牧草的成熟，CWC增加，消化率下降。草，杂类草，许多浏览叶，多汁的浏览树枝的消化率显着相关的真消化率的总结方程估计。成熟枝条干物质消化率与细胞含量呈显著正相关，真消化率的估算值有超过实测值的趋势。食物的消化程度和消化速度不同，很大程度上是因为它们的纤维含量不同.具有高CWC水平的植物，特别是当与高木质素含量结合时，对于小型反刍动物来说是低质量的饲料。J. WILDL。管理。38（2）：197-209本研究的目的是确定不同类型牧草之间的主要区别特征，并将这些特征与经瘤胃插管山羊的尼龙袋技术估计的相对消化率相关联。用货车索斯特（1967）的综合系统分析了大量的草、杂类草、细枝和落叶样品，并对一式两份样品进行了体内微量消化。由于纤维含量是已知的组织成熟度增加，饲料样品收集在不同的季节。不同牧草的纤维组成、成熟度增加引起的组成变化以及牧草被消化的程度和速度存在差异。方法
Cell wall constituents (CWC) were usually more plentiful in grasses than in other forages at comparable phenological stages. Acid detergent lignin (ADL) was frequently a greater proportion of the acid detergent fiber (ADF) of browse leaves than of other forages. Forbs and woody twigs usually had intermediate CWC and ADL/ADF values. CWC increased and digestibility decreased as many forages matured. The digestibility of grasses, forbs, many browse leaves, and succulent browse twigs was significantly related to true digestibility as estimated by the summative equation. Dry matter di- gestibility of mature browse twigs was significantly related to cell content values, and estimated values for true digestibility tended to exceed observed values. Foodstuffs vary in degree and rate of digest- ibility largely because of their relative fiber contents. Plants with high CWC levels, especially when combined with high lignin contents, are low-quality forage for small ruminants. J. WILDL. MANAGE. 38(2):197-209 The purposes of the present study were to determine major distinguishing charac- teristics between different types of forages and to relate these characteristics to relative digestibility estimated by the nylon bag technique in ruminally cannulated goats. A large number of grass, forb, twig, and browse leaf samples were analyzed by the comprehensive system of Van Soest (1967), and duplicate samples were subjected to in vivo microdigestion. Since fiber content is known to increase with tissue maturity, forage samples were collected at different seasons. Differences were found among forages in their fiber composition, in the compositional changes associated with in- creased maturity, and in the extent and rate at which the forages were digested. METHODS