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| Effects of molasses on the fermentation characteristics of mixed silage prepared with rice straw, local vegetable by-products and alfalfa in Southeast China |
| WANG Jian1, 2, CHEN Lei1, YUAN Xian-jun1, GUO Gang1, LI Jun-feng1, BAI Yun-feng3, SHAO Tao1 |
1 Institute of Ensiling and Processing of Grass, Nanjing Agricultural University, Nanjing 210095, P.R.China
2 College of Agriculture, Hainan University, Haikou 570228, P.R.China
3 Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P.R.China |
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Abstract This experiment was conducted to study the effect of molasses on the fermentation characteristics of mixed silage ensiled rice straw and vegetable by-products with alfalfa. Mixture (202 g kg–1 dry matter (DM)) consisting of rice straw, broccoli residue and alfalfa at the ratio of 5:4:1 was ensiled with three experimental treatments: (1) no additives (control); (2) molasses at 2.5% (M1); (3) molasses at 5% (M2) on a fresh matter basis of mixture, respectively. All treatments were packed into laboratory-scale silos, and three silos per treatment were sampled on days 1, 3, 5, 14 and 30. The result showed that the pH value of all mixed silages decreased gradually with the time of ensiling except for the control silage, in which a significant increase (P<0.05) on day 30 occurred. The lactic acid content increased gradually with the time of ensiling and reached the highest value on day 14, and a marked decrease (P<0.05) was found in the control silage on day 30. The changes of acetic acid content showed similar pattern with lactic acid content. A trace amount of propionic and butyric acid contents were found in the three mixed silages during the fermentation period. Comparing to the control, M1 and M2 treatments improved the fermentation quality of mixed silages as indicated by higher (P<0.05) lactic acid contents and lower (P<0.05) pH and ammonia-N contents. The Flieg points also showed that M1 and M2 silages were well preserved, whereas the control silage had a bad quality. Overall, the findings of this study suggested that adding molasses could improve fermentation quality of mixed silage, and M1 was more suitable for practical application.
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Received: 25 March 2016
Accepted:
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| Fund: This work was supported by the project of Jiangsu Independent Innovation, China (CX(15)1003-3), the Key Technologies R&D Program of China during the 13th Five Year Plan period (2016YFC0502005), and the special project of grass of Tibetan Autonomous Region for the “13th Five-Year” Plan, China. |
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Corresponding Authors:
SHAO Tao, Tel/Fax: +86-25-84396356, E-mail: taoshaolan@163.com
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| About author: WANG Jian, Mobile: +86-15261874002, E-mail: clsungodlwx@126.com |
Cite this article:
WANG Jian, CHEN Lei, YUAN Xian-jun, GUO Gang, LI Jun-feng, BAI Yun-feng, SHAO Tao .
2017.
Effects of molasses on the fermentation characteristics of mixed silage prepared with rice straw, local vegetable by-products and alfalfa in Southeast China. Journal of Integrative Agriculture, 16(03): 664-671.
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