Chemical composition, degradation characteristics and effect of tannin on digestibility of some browse species from Kenya harvested during the wet season
Chemical composition, degradation characteristics and effect of tannin on digestibility of some browse species from Kenya harvested during the wet season
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DOI：
10.5713/ajas.2005.54
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发表时间：
2005-01-01
期刊：
影响因子：
--
通讯作者：
Fujihara, T
中科院分区：
文献类型：
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作者：
Osuga, IM;Abdulrazak, SA;Fujihara, T
进行了一项研究，目的是评估肯尼亚一些食用物种的营养价值。评估的物种包括：Bauhinia alba、Bauhinia variegata、Bridelia micrantha、Calliandra calothyrsus、Carisa edulis、Cratylia argentea、Gliricidia sepium、Lantana camara、Maerua angolensis、Sesbania micrantha 和 S. sesban。通过化学成分（包括酚类物质、体外产气量和单宁活性（单宁生物测定））对浏览物进行评估。所有物种均具有较高的粗蛋白含量（149-268 g/kg DM）和较低的NDF含量（239-549 g/kg DM）。饲料具有不同含量的总可提取单宁（JET），范围从低（3-22 mg/g DM）、中（42-58 mg/g DM）和高（77-152 mg/g DM）。 Calliandra calothyrsus 的单宁含量最高。不同物种之间的产气量存在显着差异（p < 0.05）。田菁具有最高的潜在产气量 (p < 0.05)，而 Gliricidia sepium 的产气率最高 (p < 0.05)。使用聚乙二醇（PEG 6000）评估单宁的不利影响，表明单宁含量高的浏览物种中的单宁对瘤胃微生物发酵具有抑制作用，如气体产生所示。估计的有机物消化率和代谢能也随着 PEG 的添加而增加。这项研究的结果表明，此类肯尼亚食草物种有潜力用作反刍动物的饲料补充剂。
A study was conducted with the objective of evaluating the nutritive value of some browse species from Kenya. The species evaluated included: Bauhinia alba, Bauhinia variegata, Bridelia micrantha, Calliandra calothyrsus, Carisa edulis, Cratylia argentea, Gliricidia sepium, Lantana camara, Maerua angolensis, Sesbania micrantha and S. sesban. The browses were evaluated by their chemical composition including phenolics, in vitro gas production and tannin activity (tannin bioassay). All the species had high crude protein content (149-268 g/kg DM) and low NDF content (239-549 g/kg DM). The feeds had varying contents of total extractable tannins JET) ranging from low (3-22 mg/g DM), moderate (42-58 mg/g DM) and high (77-152 mg/g DM). Calliandra calothyrsus had the highest tannin content. Significant (p < 0.05) variation in gas production was recorded among the species. Sesbania micrantha had the highest (p < 0.05) potential gas production while Gliricidia sepium had the highest (p < 0.05) rate of gas production. Use of polyethylene glycol (PEG 6000), to assess the adverse affect of tannins, indicated that tannins in browse species with high tannin content had inhibitory effects on rumen microbial fermentation as indicated by the gas production. Estimated organic matter digestibility and metabolizable energy also increased with PEG addition. The results of this study indicate that such Kenyan browse species have the potential to be used as feed supplements for ruminant animals.