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Acta Prataculturae Sinica ›› 2025, Vol. 34 ›› Issue (3): 123-133.DOI: 10.11686/cyxb2024179

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Effects of different lactic acid bacteria strains on fermentation quality and mycotoxin contents of whole-plant corn silage

Yu-cheng LIANG(), Xiao-wen ZHANG, Tao SHAO, Wen-bo WANG, Xian-jun YUAN()   

  1. College of Grass Industry,Nanjing Agricultural University,Nanjing 210095,China
  • Received:2024-05-14 Revised:2024-06-05 Online:2025-03-20 Published:2025-01-02
  • Contact: Xian-jun YUAN

Abstract:

The study aimed to evaluate the effects of Lactobacillus paracasei LS2, Lactiplantibacillus plantarum S6-2, and Lactobacillus casei GD2-1 on the fermentation quality and mycotoxin concentrations in corn silage. Fungal infected (FI) or non-fungal infected (NFI) whole-plant corn was ensiled with: 1) no treatment (CON), 2) L. paracasei (LS2), 3) L. plantarum (S6-2), or 4) L. casei (GD2-1) for 180 days. The results indicated that inoculation withGD2-1 significantly reduced the ammonia nitrogen contents, and all three lactic acid bacterial strains significantly increased the water-soluble carbohydrate contents in the NFI treatments (P<0.05). Inoculation withS6-2 significantly reduced the ammonia nitrogen contents, and inoculation withLS2 andS6-2 increased the water-soluble carbohydrate content in the FI treatments (P<0.05). The LS2 inoculated silages showed the highest acetic acid contents. Fungal infection significantly increased the concentrations of deoxynivalenol and zearalenone in fresh corn. The detoxification effects of lactic acid bacteria were mycotoxin-dose dependent. The inoculants did not affect the zearalenone concentration in FI and NFI silages and deoxynivalenol in NFI silages. Inoculating LS2,S6-2, and GD2-1 significantly (P<0.05) decreased the aflatoxin B1 concentration in FI silages, andS6-2 significantly (P<0.05) decreased the deoxynivalenol concentration in FI silages. In summary, inoculating the three lactic acid bacteria reduced the ammonia-nitrogen concentration and increased the water-soluble carbohydrates and acetic acid contents during the ensiling, improving the fermentation quality of the whole-plant corn silage. The three strains did not significantly affect the zearalenone contents of FI and NFI silages, but reduced the concentration of aflatoxin B1 in FI silages, and S6-2 reduced the deoxynivalenol concentration in the FI silages.

Key words: whole-plant corn silages, lactic acid bacteria, mycotoxins, fermentation quality