Effect of different additives on quality of napiergrass silage

The objectives of this experiment were to investigate the effect of different additives on quality of napiergrass (Pennisetum purpureum Schum) silage. Napiergrass Taishi No. 2 (cv. TLG2) with high water soluble carbohydrates was used to make silages added with corn meal or wheat bran, followed by adding with or without enzyme. Crude protein, acid detergent fiber, neutral detergent fiber, water soluble carbohydrates and volatile fatty acid contents of silage were determined to evaluate silage quality. The results showed that cv. TLG2 could make good silages without any additives added, while the dry matter percent was low. Napiergrass added with 5 -10% of corn meal or wheat bran not only increased the dry matter and crude protein contents, but it also decreased the contents of acid detergent fiber and neutral detergent fiber. Lactic acid was the main preservative organic acid in all silages. The main effect of the enzyme product was the decrease of neutral detergent fiber content of silage and the best result was obtained from the control treatment with an enzyme product added to cv. TLG2. According to the quality of silages and the cost of additives, it was suggested that it might be a better choice by adding with 5 -10% of wheat bran in napiergrass to make silage.

關鍵字

Napiergrass ； Silage ； Additives ； Forage quality

並列摘要

狼尾草為國內草食動物主要牧草來源，為能全年穩定供應，於盛產季節調製青貯料為一可行之方法，因此，本試驗目的在於瞭解不同添加劑對於狼尾草台畜草二號青貯品質之影響，以供狼尾草青貯調製時之參考。試驗處理包括於適期收穫之狼尾草添加5－10%玉米粉、5－10%麩皮及牧草纖維分解酵素等。青貯品質分析項目包括乾物質、粗蛋白質、中洗與酸洗纖維、水溶性碳水化合物、脂肪酸等。由試驗結果顯示，狼尾草台畜草二號可單獨調製為良好青貯料，然乾物質偏低，添加5－10%之玉米粉或麩皮，不但青貯料乾物質增加，粗蛋白質亦增加，而中洗與酸洗纖維降低，乳酸為青貯料脂肪酸之主要部分，然水溶性碳水化合物降低。酵素處理之效果以降低中洗纖維最為明顯，其中以狼尾草台畜草二號單獨以牧草纖維分解酵素處理效果最佳，不論粗蛋白質、中洗與酸洗纖維、水溶性碳水化合物及乳酸含量皆有顯著差異。由青貯品質與添加劑成本等考量，建議以添加5－10%麩皮為適宜之選擇。

並列關鍵字

狼尾草；青貯料；添加劑；牧草品質

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