Chemical composition and digestibility of some browse plant species collected from Algerian arid rangelands
Chemical composition and digestibility of some browse plant species collected from Algerian arid rangelands
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DOI：
10.5424/sjar/2012101-134-11
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发表时间：
2012-03-01
影响因子：
0.9
通讯作者：
Bouazza, L.
中科院分区：
文献类型：
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作者：
Boufennara, S.;Lopez, S.;Bouazza, L.
许多野生草本植物和灌木物种的价值被低估，主要是因为对它们潜在的饲用价值了解不足。本研究的目的是评价阿尔及利亚不同树种(白三叶、油蒿、艾草、黄芪、石斑茅、雷塔姆、刺叶针茅、金针茅和小针茅)的某些营养属性。测定了化学成分、酚类物质和单宁浓度、体外消化率、体外产气动力学和用缓冲瘤胃液测定单宁的体外生物测定，以及植物可食部分(叶、细枝和花)的原位消失率。总体而言，双子叶植物的蛋白质含量始终高于单子叶植物，表现为中性和酸性洗涤纤维含量高于双子叶植物，木质素含量低于双子叶植物。不同树种间单宁含量差异较大，但总体来说，所研究的植物单宁含量较低(除蒿属植物外)。和柔韧螺旋藻(S.tenacissima)。单子叶植物的体外消化率和原位消化率、发酵速率、累积产气量和降解程度均低于双子叶植物。通过主成分分析将植物聚为两类：劣质牧草和最易消化的双子叶植物。化学成分(中性洗涤剂、纤维和蛋白质)和消化率是决定排名的主要影响变量。综上所述，哈利姆、野油菜、草本植物和羊草的营养价值高于应被认为是应急粗饲料的高纤维和低消化率的牧草(刺刺草、麦角草和柔韧草)。
Many wild browse and bush species are undervalued mainly because of insufficient knowledge about their potential feeding value. The objective was to evaluate some nutritional attributes of various Algerian browse and shub species (A triplex halimus, Artemisia campestris, Artemisia herba-alba, Astragalus gombiformis, Calobota saharae, Retama raetam, Stipagrostis pungens, Lygeum spartum and Stipa tenacissima). Chemical composition, phenols and tannins concentration, in vitro digestibility, in vitro gas production kinetics and in vitro bio-assay for assessment of tannins using buffered rumen fluid, and in situ disappearence of the edible parts of the plants (leaves, thin twigs and flowers) were determined. In general, protein content in dicotyledon species was always greater than in monocotyledon grasses, these showing higher neutral and acid detergent fibre and lower lignin contents than dicots. The tannin concentrations varied considerably between species, but in general the plants investigated in this study had low tannin contents (except for Artemisia spp. and S. tenacissima). Monocots showed lower in vitro and in situ digestibilities, fermentation rate, cumulative gas production and extent of degradation than dicot species. The plants were clustered by principal components analysis in two groups: poor-quality grasses and the most digestible dicot species. Chemical composition (neutral detergent fibre and protein) and digestibility were the main influential variables determining the ranking. In conclusion, A. halimus, A. campestris, A. herba-alba and A. gombiformis can be considered of greater nutritional value than the highly fibrous and low digestible grasses (S. pungens, L. spartum and S. tenacissima) that should be considered emergency roughages.