Lynch J P, O'Kiely P, Murphy R, Doyle E M
Animal & Grassland Research and Innovation Centre, Teagasc, Grange, Dunsany, Co., Meath, Ireland; School of Biology and Environmental Science, University College Dublin, Belfield, Dublin, Ireland.
J Anim Physiol Anim Nutr (Berl). 2014 Aug;98(4):731-8. doi: 10.1111/jpn.12131. Epub 2013 Sep 24.
Maize stover (total stem and leaves) is not considered a ruminant feed of high nutritive value. Therefore, an improvement in its digestibility may increase the viability of total forage maize production systems in marginal growth regions. The objective of this study was to describe the changes in chemical composition during the storage of contrasting components of maize stover (leaf, upper stem and lower stem) treated with either of two lignin degrading white-rot fungi (WRF; Pleurotus ostreatus, Trametes versicolor). Three components of maize stover (leaf, upper stem and lower stem), harvested at a conventional maturity for silage production, were digested with either of two WRF for one of four digestion durations (1-4 months). Samples taken prior to fungal inoculation were used to benchmark the changes that occurred. The degradation of acid detergent lignin was observed in all sample types digested with P. ostreatus; however, the loss of digestible substrate in all samples inoculated with P. ostreatus was high, and therefore, P. ostreatus-digested samples had a lower dry matter digestibility than samples prior to inoculation. Similarly, T. veriscolor-digested leaf underwent a non-selective degradation of the rumen-digestible components of fibre. The changes in chemical composition of leaf, upper stem and lower stem digested with either P. ostreatus or T. veriscolor were not beneficial to the feed value of the forage, and incurred high DM losses.
玉米秸秆（茎和叶的总和）不被视为具有高营养价值的反刍动物饲料。因此，提高其消化率可能会提高边际生长地区全株青贮玉米生产系统的可行性。本研究的目的是描述用两种木质素降解白腐真菌（WRF；糙皮侧耳、云芝）之一处理的玉米秸秆不同组成部分（叶、上茎和下茎）在储存期间的化学成分变化。在常规成熟期收获用于青贮生产的玉米秸秆的三个组成部分（叶、上茎和下茎），用两种WRF之一进行四种消化持续时间（1 - 4个月）中的一种的消化处理。在真菌接种前采集的样本用于衡量所发生的变化。在用糙皮侧耳消化的所有样本类型中均观察到酸性洗涤木质素的降解；然而，接种糙皮侧耳的所有样本中可消化底物的损失都很高，因此，用糙皮侧耳消化的样本的干物质消化率低于接种前的样本。同样，用云芝消化的叶对纤维的瘤胃可消化成分进行了非选择性降解。用糙皮侧耳或云芝消化的叶、上茎和下茎的化学成分变化对草料的饲料价值没有益处，并导致了高干物质损失。
