Effects of harvest stage and re-growth on yield, composition, ensilage and in vitro digestibility of new forage sorghum varieties
Effects of harvest stage and re-growth on yield, composition, ensilage and in vitro digestibility of new forage sorghum varieties
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DOI：
10.1002/jsfa.2269
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发表时间：
2006-01-15
影响因子：
4.1
通讯作者：
Ben-Ghedalia, D
中科院分区：
文献类型：
--
作者：
Miron, J;Solomon, R;Ben-Ghedalia, D
研究了高粱新杂交种BMR-101、Silobuster和商品化品种FS-5的生育期和再生期对其营养特性和青贮特性的影响。品种在夏季抽穗初期(EH)取样，在软面团(SD)阶段收获。额外的灌溉使秋季得以重新生长和第二次收获。FS-5和BMR-101植株在EH上表现抗倒伏。然而，BMR-101和Silobuster在夏收的SD阶段遭受高倒伏。EH时，FS-5和BMR-101的干物质含量均低于250GKG(-1)。夏收时各品种的干物质产量相似，高于各自的再生期产量。青贮料干物质损失适中，不同品种间相似。SD植株的半纤维素被部分溶解，大部分水溶性碳水化合物被发酵，产生乳酸、乙醇和挥发性脂肪酸(VFA)，pH=lt；4。夏季青贮料的干物质消化率与夏季青贮料相似，但分别在FS-5和BMR-101再生青贮料中较低，这反映了再生青贮料中中性洗涤纤维和木质素的含量较高。FS-5、Silobuster和BMR-101青贮料的夏季可消化干物质累积产量分别为14.7、16.6和14.5tha(-1)。商品品种FS-5可能比BMR-101和Silobuster有一些优势，因为它除了高产和良好的青贮性能外，还具有相对抗倒伏的能力。(C)2005年化学工业学会。
The effect of growth stage and re-growth on the nutritional and ensilage characteristics of two new sorghum hybrids, BMR-101 and Silobuster, and one commercial variety, FS-5, was examined in this study. Varieties were sampled during the summer at the early heading (EH) stage and were harvested at the soft dough (SD) stage. Additional irrigation enabled autumn re-growth and a second harvest. Plants of FS-5 and BMR-101 were resistant to lodging at EH. However, BMR-101 and Silobuster suffered from high lodging at the SD stage of the summer harvest. Dry matter (DM) content of FS-5 and BMR-101 at EH was below 250 gkg(-1). DM yields of the varieties were similar at the summer harvest and higher than their respective re-growth cuts. Ensilage DM losses were moderate and similar across varieties. Hemicellulose of SD plants was partly solubilised and most of the water-soluble carbohydrate fermented, yielding lactic acid, ethanol and volatile fatty acids (VFA), and a pH < 4. In vitro DM digestibility of varieties was similar in summer silages, but lower in the respective re-growth silages of FS-5 and BMR-101, reflecting the higher content of neutral detergent fibre and lignin in the re-growth silages. The summer plus re-growth cumulative yields of digestible DM of the respective FS-5, Silobuster and BMR-101 silages were 14.7, 16.6 and 14.5 t ha(-1). The commercial variety, FS-5, may have some advantage over BMR-101 and Silobuster owing to its relative resistance to lodging in addition to its high yield and good ensilage properties. (c) 2005 Society of Chemical Industry.