Effects of Lactic Acid Bacteria and Cutting Height on Fermentation Quality and Microbial Composition of Whole-Plant Corn Silage Lodged by Wind Disaster

  • YANG Jingjing ,
  • SUN Yun ,
  • WU Qingyu ,
  • WANG Jian ,
  • ZHANG Jiabin ,
  • SUN Haixia ,
  • CAO Yang
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  • 1. Heilongjiang Provincial Key Laboratory of Efficient Utilization of Feed Resources and Nutrition Manipulation in Cold Region, College of Animal Science and Technology, Heilongjiang Bayi Agricultural University, Daqing 163319, China;
    2. Engineering Research Center of Processing and Utilization of Grain By-Products, Ministry of Education, Daqing 163319, China;
    3. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China

Received date: 2021-08-22

  Online published: 2022-04-14

Abstract

In order to explore the safe and high-quality roughage processing technology of disaster-stricken lodging corn, the raw material indices of this experiment adopted two factors (2 disaster conditions×4 cutting heights) and the silage indices adopted three factors (2 disaster conditions×2 additions×4 cutting heights) in a completely randomized trial design. The whole-plant corn disaster conditions were divided into lodging and upright (control), the addition treatments included lactic acid bacteria (Lactobacillus plantarum) preparation added and no addition (control), and the cutting heights were set to 10, 20, 30 and 40 cm, respectively. The nutrients, fermentation quality and microbial composition in corn silage were analyzed by small-scale fermentation and sealed storage at room temperature for 30 days. The results showed as follows:1) before ensiling, the neutral detergent fiber (NDF) content in corn raw materials in upright group and lodging group decreased significantly with the increase of cutting height (P<0.05), only the yeast number in upright group increased significantly with the increase of cutting height (P<0.05), and no Bacillus, Clostridium butyricum and mold were found in all corn raw materials. The disaster condition and the cutting height had significant interactive effect on yeast number (P<0.05). 2) Most whole-plant corn silage was yellowish green, the stems and leaves were soft, moist and sour, and the sensory quality was basically similar and there was no mildew. 3) The crude protein (CP) content in corn silage in lodging group was significantly lower than that in upright group (P<0.05), and the dry matter content in silage with lactic acid bacteria addition was significantly higher than that in non-addition treatment (P<0.05). The NDF content in corn silage decreased significantly with the increase of cutting height (P<0.05). The acid detergent fiber content in lodging group without addition was lower at 30 cm cutting height, and the CP content was significantly higher than that at 20 cm cutting height (P<0.05). 4) The contents of lactic acid (LA) and acetic acid in corn silage in lodging group were significantly lower than those in upright group (P<0.05). The pH decreased significantly after the addition of lactic acid bacteria (P<0.05). The butyric acid was not detected in all silage. The addition of lactic acid bacteria and cutting height had significantly interactive effect on LA content (P<0.05). 5) There was no significant difference in the number of microorganisms in corn silage between lodging group and upright group (P>0.05). After adding lactic acid bacteria, the lactic acid bacteria number increased significantly (P<0.05), while the numbers of Escherichia coli and yeast decreased significantly (P<0.05), and the lactic acid bacteria number was the highest in lodging group at 30 cm cutting height. No Bacillus, Clostridium butyricum and mold were found in all silage. In conclusion, after corn plant lodging, the addition of lactic acid bacteria can improve its silage quality and reduce the loss of nutrients. At the same time, lodging whole-plant corn cutting for about 30 cm will be beneficial to the preparation of high-quality silage.

Cite this article

YANG Jingjing , SUN Yun , WU Qingyu , WANG Jian , ZHANG Jiabin , SUN Haixia , CAO Yang . Effects of Lactic Acid Bacteria and Cutting Height on Fermentation Quality and Microbial Composition of Whole-Plant Corn Silage Lodged by Wind Disaster[J]. Chinese Journal of Animal Nutrition, 2022 , 34(4) : 2542 -2556 . DOI: 10.3969/j.issn.1006-267x.2022.04.049

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