Effect of molasses on fermentation quality of wheat straw ensiled with perennial ryegrass

文献类型： 外文期刊

第一作者： Dong, Dong

作者： Dong, Dong;Xu, Guofeng;Dai, Tongtong;Zong, Cheng;Yin, Xuejing;Shao, Tao;Bao, Yuhong

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关键词： dynamic; evaluation; fermentation quality; mixed ensilage; mixed ratios; molasses rates; perennial ryegrass; wheat straw

期刊名称：ANIMAL PRODUCTION SCIENCE （ 影响因子：1.57； 五年影响因子：1.816 ）

ISSN： 1836-0939

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收录情况： SCI

摘要： Context. Insufficient supply of silage has limited the development of animal husbandry in Tibet, where natural pasture may not meet requirements. Although wheat (Triticum aestivum L.) straw could be a supplementary forage, it is difficult to ensile. Mixing perennial ryegrass (Lolium perenne L.) and adding molasses may help to facilitate successful ensilage. Aims. The objectives were to determine the proper mixing ratios of wheat straw and perennial ryegrass for silage, and to evaluate the effects of different levels of molasses on fermentation quality. Methods. In Experiment 1, wheat straw was ensiled without perennial ryegrass or mixed at ratios of 4:1, 3:2 and 2:3 (fresh-weight basis). Fermentation quality was evaluated when the laboratory silos were opened after 7, 14, 30 and 60 days. In Experiment 2, a mixture of wheat straw and perennial ryegrass (2:3) was treated with 0%, 3%, 4% and 5% molasses (fresh-weight basis) and ensiled. Fermentation quality was determined at 7, 14, 30 and 60 days. Key results. In Experiment 1, inclusion of perennial ryegrass significantly (P < 0.05) increased lactic acid and water-soluble carbohydrate contents and the lactic acid:acetic acid ratio, and significantly (P < 0.05) decreased pH and contents of ammonia-nitrogen, acetic acid, butyric acid and total volatile fatty acids. The 2:3 mixture of wheat straw ensiled with perennial ryegrass was judged the best, with the highest lactic acid content and lowest pH and butyric acid content (P < 0.05). In Experiment 2, molasses addition significantly (P < 0.05) increased lactic acid, water-soluble carbohydrate and dry matter contents, and significantly (P < 0.05) decreased pH and ammonia-nitrogen content compared with the control. Trace amounts of propionic and butyric acids were observed in all silages. Fermentation quality was similar among all treatments with added molasses. Conclusions. Considering the costs of additives, 3% molasses was most suitable for practical application when ensiling wheat straw with perennial ryegrass at an optimum ratio of 2:3.

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