- 期刊
狼尾草品系水溶性碳水化合物含量與青貯品質之關係
Effect of Water Soluble Carbohydrate Contents and Silage Qualities in Napiergrasses (Pennisetum purpureum Schum.)
摘要
本試驗主要在探討狼尾草品系水溶性碳水化合物含量與青貯品質之關係。試驗材料包含台畜育三號（No.7728）、No.7439、No.7342、台畜草二號、Bana、Mott、No.7734、A146、A148、A149及NBM共計11種不同株型及倍數體之狼尾草品系，每隔約70天收穫一次，收穫後即行青貯，連續進行二年青貯試驗。參試狼尾草之水溶性碳水化合物含量與青貯品質均隨品系及收穫季節有顯著差異。在水溶性碳水化合物方面，以品系台畜草二號、No.7439及Bana之含量較高。同時，青貯結果也以高水溶性化合物含量品系之表現較佳。品系之平均水溶性碳水化合物含量與品系平均青貯品質評分間具顯著相關（r=0.97**），顯示狼尾草品系之水溶性碳水化合物含量是影響狼尾草青貯潛力的重要因子。進一步分析發現，在10次收穫當中，參試各品系之水溶性碳水化合物含量與乾物率均為正相關，而且兩項因子在各品系的變動幅度不一。因此，雖然水溶性碳水化合物含量是狼尾草青貯的重要影響因素，但牧草水份含量對青貯的影響也同時存在。本研究結果亦指出狼尾草青貯之發酵總酸量隨水份含量降低而降低，但青貯料之乳酸含量只在適當之水份含量（或水溶性碳水化合物含量）下表現較佳，水份過高或過低，乳酸含量均降低。因此，狼尾草青貯時應選用高水溶性碳水化合物品系，如台畜草二號，並注意收穫時之乾物含量，以台畜草二號為例，青貯時較佳的乾物率為18-25%。
並列摘要
The purpose of this study is to investigate the relationship between water soluble carbohydrates (WSC) contents and silage quality of napiergrasses. The napiergrass accesses used in this experiment were No.7728, No. 7439, No. 7342, TLG2, Bana, Mott, No.7734, A146, A148, A149 and NBM, which included different plant types and ploidy. The grass was harvested about every 70 days and was ensilaged immediately, and the experiment was thus continued for two years. The WSC contents and silage quality of napiergrass were various among lines and harvest dates. The TLG2, No.7439 and Bana had higher WSC contents and better silage qualities than others. The averaged WSC content of the napiergrass lines were highly correlated to Flieg's score (r =0.97). The results showed that the WSC content was an important factor affecting ensiling potential of the napiergrass. Furthermore, the WSC content was negatively correlated to the moisture content for every napiergrass accesses and the relationship between WSC contents and moisture contents for each lines varied. Although the WSC content was an important factor affecting ensiling process, its effect on ensiling was interfered by moisture content. The contents of total fermentation products increased as moisture content of the grass increased. However, high lactic acid contents could be obtained only at the appropriate moisture content. Therefore, napiergrass lines with higher WSC content is necessary for silage production and the moisture content at harvest time is also critical. For TLG2, the appropriate dry matter content is between 18% to 25%.
延伸閱讀
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