| 摘要: |
| 【目的】研究不同生长阶段紫羊茅营养成分及其绵羊瘤胃降解动态。【方法】以紫羊茅为研究对象，分别测定其4个不同生长阶段(分蘖期、拔节期、开花期、成熟期)的营养成分含量；同时选择装有永久性瘤胃瘘管的小尾寒羊6只，测定紫羊茅各生长阶段常规营养成分的瘤胃降解动态。【结果】1)不同生长阶段紫羊茅各营养物质的含量差异显著(P＜0.05)；随着生长阶段的推进，粗蛋白（CP）和Ca含量呈下降趋势，中性洗涤纤维（ NDF）、酸性洗涤纤维（ADF）含量呈升高趋势；P含量却在分蘖期、拔节期差异不显著，开花期含量较高。2)分蘖期、拔节期、开花期和成熟期紫羊茅的总氨基酸（TAA）含量分别为15.29%，12.55%，10.60%和7.02%，17种氨基酸含量随着紫羊茅生长阶段的推进逐渐降低，且分蘖期最高，成熟期较低；总必需氨基酸/总氨基酸（TEAA/TAA）、总必需氨基酸/非必需氨基酸（TEAA/NEAA）呈现高 低 高 低趋势，TAA/CP呈现高 低 高趋势。3)紫羊茅营养成分在瘤胃中降解的难易程度有极显著差异(P＜0.01)；随着生长阶段的推进，紫羊茅营养成分的有效降解率极显著下降(P＜0.01)，都在分蘖期最高，成熟期最低。【结论】综合紫羊茅不同生长阶段营养成分含量及瘤胃降解动态，建议在开花期对紫羊茅刈割利用。 |
| 关键词: 生长阶段 紫羊茅 瘤胃降解率 |
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| 基金项目:河南省重大科技攻关项目(092101110100)；河南省世行贷款生态畜牧业项目(WX2010-166-1-1)；郑州牧业工程高等专科学校科技创新团队项目(2011014003)；郑州市重点科技攻关项目 |
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| Nutrients and sheep rumen degradation dynamics of red fescue at different growth stages |
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| Abstract: |
| 【Objective】The study investigated the nutrients and sheep rumen degradation dynamics of red fescue at different growth stages.【Method】Nutrient contents of red fescue at four different growth stages,tillering stage,jointing,flowering and maturity were measured,rumen degradation dynamic of different childbearing period nutrients in 6 Small Tail Han sheep with permanent ruminal cannulas was determined.【Result】1)Nutrient contents of red fescue at different growth stages were different (P＜0.05).CP and Ca contents decreased as the advance of the growth period while contents of DM,NDF and ADF increased.P contents at flowering period were high and that at tillering stage and jointing stage had no significant difference.2) TAA contents of red fescue at tillering stage,jointing stage,flowering stage and maturity stage respectively were 15.29%,12.55%,10.60%,7.02%,respectively.17 amino acids gradually decreased as the advance of growth with the highest contents at tillering stage,and the lowest contents at mature stage.Values of TEAA/TAA and TEAA/NEAA exhibited a “high-low-high-low” trend and values of TAA/CP exhibited a “high-low-high” trend.3) The degrees of difficulty in degrading red fescue nutrients in the rumen were significant different (P＜0.01).With the postponement of fertility,the degradation rates of the nutrients gradually decreased (P＜0.01) with the lowest level in tillering stage and the highest in the maturity stage.【Conclusion】Considering the nutrients of red fescue in different growth stages,rumen degradation dynamics and crop yield balance,mowing of red fescue in the flowering stage was recommended. |
| Key words: growth period red fescue rumen degradability |
