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題 名 | 以瘤胃袋法評估氮肥用量對盤固草蛋白質分解率之影響=Effects of Nitrogen Fertilizer Levels on in Situ Protein Degradability of Pangola Grass |
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作 者 | 施意敏; 廖成康; 李春芳; | 書刊名 | 中華農學會報 |
卷 期 | 179 1997.09[民86.09] |
頁 次 | 頁30-43 |
分類號 | 437.113 |
關鍵詞 | 盤固草; 苜蓿; 花生藤; 瘤胃有效分解率; Pangola grass; Alfalfa; Peanut stover; Degradability; |
語 文 | 中文(Chinese) |
中文摘要 | 本試驗主要探討氮肥用量(100, 150, 200 kg N/ha/cut)對盤固草A254 ( Digitaria decumbens )的乾物質及蛋白質在瘤胃裡有效分解率( effective degradability )之影響, 並比較苜蓿( Medicago sativa )及多年生花生( Arachis glabrata )之花生藤等豆科牧草與盤固草在瘤胃裡分解特性的差異。 將試驗樣品分別放入 孔隙大小為 52 ± 16 μ m 的消化袋, 然後將消化袋放入開窗牛的瘤胃裡, 分別培養 0, 2, 6, 12, 18, 24, 36, 48, 60, 72 h,利用 Orskov 發展的蛋白質分解模式, 分別求 出乾物質及蛋白質在瘤胃裡可迅速分解的比例、分解速率及不可消化的部分,並估算各草樣 的乾物質及蛋白質在瘤胃裡的有效分解率。試驗結果顯示,苜蓿的乾物質在瘤胃裡的有效分 解率( 61.81% ),顯著高於多年生花生( 51.61% )及盤固草( 45.32% )。盤固草的蛋 白質在瘤胃裡可迅速分解的比例( 41.14% ),分解速率( 3.51%/h ), 及有效分解率( 58.10% )皆顯著低於苜蓿及多年生花生, 而以苜蓿蛋白質的分解速率( 10.69%/h )及有 效分解率( 79.22% )最高。氮肥用量對盤固草乾物質的有效分解率並無顯著的影響。隨氮 肥用量增加,盤固草的粗蛋白質含量及水溶性氮與非水溶性氮的比例亦隨之增加。低氮肥處 理的盤固草,其蛋白質在瘤胃裡的有效分解率亦較低,可能與其蛋白質中快速分解的比率較 其他處理為低有關。因此很可能因盤固草施用氮肥後,促進水溶性氮的增加,使得蛋白質在 瘤胃裡快速分解的部分提高,因而導致蛋白質在瘤胃裡有效分解率的增加。 |
英文摘要 | The objectives of this experiment were to study the effects of nitrogen fertilizer levels (100, 150, 200 kg N/ha/cut) on in situ dry matter and crude protein degradability of pangola grass (Digitaria decumbens). On the other hand, pangola grass were compared to legume such as alfalfa (Medicago sativa) and perennial peanut stover (Arachis glabrata) in dry matter and crude protein degradation. Dry matter and crude protein degradability was determined by placing samples in polyester bags with 52 ± 16 μ m pore sizes which were then put into the rumen of two cows for 0, 2, 6, 12, 18, 24, 36, 48, 60, 72h. The kinetics of dry matter and crude protein degradation were examined using Orskov's model. The dry matter of alfalfa has higher effective degradability (61.81%) in the rumen than perennial peanut stover (51.61%) and pangola grass (45.32%). The effictive degradability (79.22%), degration rate (10.69%h) and rapidly degradable fraction (51.42%) for crude protein of alfalfa were higher than perennial peanut. The rapidly degradable fraction, rate of degradation, and effective degradability for crude protein of pangola grass were significantly lower than alfalfa and perennial peanut. There were no effects of nitrogen fertilizer on dry matter degradability of pangola grass. The concentration of crude protein and the ratio of water-soluble nitrogen to water-insoluble nitrogen of pangola grass were increased by nitrogen fertilizer. The lower crude protein degradability (54.77%) of pangola grass treated with 100 N kg/ha/cut may be explained by the lower amount of the rapidly degradable fraction (37.30%). The rate of crude protein degradation and indigestible fraction were not influenced by nitrogen fertilizer. Based on the results, it is suggested that more nitrogen applied increase the concentration of water-soluble nitrogen in pangola grass that may influence the rapidly degradable fraction of protein and then increase the effective degradability in the rumen. |
本系統中英文摘要資訊取自各篇刊載內容。