Relationships of fibre, lignin, and phenolics to in vitro fibre digestibility in three perennial grasses
Relationships of fibre, lignin, and phenolics to in vitro fibre digestibility in three perennial grasses
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DOI：
10.1016/j.anifeedsci.2005.05.015
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发表时间：
2006-01-06
影响因子：
3.2
通讯作者：
Jung, HJG
中科院分区：
文献类型：
--
作者：
Casler, MD;Jung, HJG
提高饲料的消化率可以改善牲畜的生产性能，而消化率是营养质量的关键因素之一。通过培育细胞壁结构改良的饲料作物，提高细胞壁能量对瘤胃微生物和家畜的潜在利用率，可以提高饲料的消化率。本研究的目的是确定木质素和酚类成分之间的相互关系的纤维部分的三个多年生牧草，并确定其影响在体外纤维消化率。醚化和酯化阿魏酸和酯化对香豆酸三个多年生禾本科植物的克隆之间的差异，一般重复整个收获。中性洗涤纤维（NDF）和Klason木质素的NDF馏分内的浓度是最限制24小时体外消化率的因素，NDF是最重要的。Klason木质素和醚化阿魏酸酯是所有三个物种的96小时体外消化率的最限制因素。无芒雀麦（Bromus inermis Leyss）和鸭茅（Dactylis glomerata L.）的低醚化阿魏酸含量与NDF呈正相关，应避免选择。这应该是可能的选择和培育低浓度的木质素，以提高消化率，而不减少NDF在这两个物种。然而，在芦苇草（Phalaris arundinacea L.）中，木质素和醚化阿魏酸酯与NDF呈正相关，表明选择增加的消化率应直接基于体外消化率的某些测量，以避免与NDF减少相关的适合度问题。由爱思唯尔公司出版
Livestock performance can be improved by increasing the digestibility of feeds, one of the key elements of nutritional quality. Digestibility of feeds can be improved by breeding forage crops with modified cell-wall structure, increasing the potential availability of energy from the cell wall to rumen microbes and livestock. The objectives of this research were to identify interrelationships among lignin and phenolic components of the fibre fraction of three perennial grasses and to determine their influence on in vitro fibre digestibility. Differences in etherified and esterified ferulate and esterified p-coumarate among clones of three perennial grasses were generally repeatable across harvests. The concentration of neutral detergent fibre (NDF) and Klason lignin within the NDF fraction were the factors most limiting to 24-h in vitro digestibility, with NDF being the most important. Klason lignin and etherified ferulate were the factors most limiting to 96-h in vitro digestibility for all three species. Due to its positive correlation with NDF, selection for low etherified ferulate should be avoided in smooth bromegrass (Bromus inermis Leyss) and cockfsoot (Dactylis glomerata L.). It should be possible to select and breed for low concentrations of lignin to improve digestibility without decreasing NDF in these two species. However, in reed canarygrass (Phalaris arundinacea L.), both lignin and etherified ferulate were positively correlated with NDF, indicating that selection for increased digestibility should be based directly on some measure of in vitro digestibility to avoid the fitness problems associated with reduced NDF. Published by Elsevier B.V.