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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (7): 122-134.DOI: 10.11686/cyxb2022343

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Effects of Lentilactobacillus buchneri combined with different sugars on nutrient composition, fermentation quality, rumen degradation rate, and aerobic stability of alfalfa silage

Wen-qing LING1(), Lei ZHANG1(), Jue LI1, Qi-xian FENG1, Yan LI1,2, Yi ZHOU1, Yi-jia LIU1,2, Fu-lin YANG1(), Jing ZHOU2()   

  1. 1.College of Animal Sciences (College of Bee Science),Fujian Agriculture and Forestry University,Fuzhou 350002,China
    2.China National Engineering Research Center of Juncao Technology,Fujian Agriculture and Forestry University,Fuzhou 350002,China
  • Received:2022-08-27 Revised:2022-11-21 Online:2023-07-20 Published:2023-05-26
  • Contact: Fu-lin YANG,Jing ZHOU

Abstract:

The aim of this experiment was to investigate the effects of Lentilactobacillus buchneri combined with different sugars on the nutrient composition, fermentation quality, rumen degradation rate and aerobic stability of alfalfa silage. Four treatments were employed: LB (1×106 cfu·g-1L. buchneri), GLB (1×106 cfu·g-1L. buchneri and 2% glucose), FLB (1×106 cfu·g-1L. buchneri and 2% fucoidan), CK (no additive). After 60 days of ensiling, the nutrient composition, fermentation quality, rumen degradation rate, and aerobic stability of alfalfa silages with the above four treatments were measured. It was found that in terms of nutrient composition, compared with the CK, all treatments significantly increased the alfalfa silage dry matter (DM), crude protein (CP) and water-soluble carbohydrate (WSC) contents (P<0.05) and the DM and CP contents were highest in the GLB treatment, while the WSC content was highest in the FLB treatment. Compared to CK, all treatments significantly reduced the content of acid detergent fiber (ADF) (P<0.05) and the GLB treatment significantly reduced the content of neutral detergent fiber (NDF, P<0.05). With respect to fermentation quality, the LB and GLB treatments significantly reduced the silage pH (P<0.05) compared with CK, while the GLB treatment significantly increased the content of lactic acid (LA) and propionic acid (PA) (P<0.05), and significantly reduced the ammonia nitrogen∶total nitrogen ratio (AN∶TN) (P<0.05). Compared to CK, the content of LA, acetic acid (AA) and AN∶TN in LB and FLB treatments decreased significantly (P<0.05), while PA increased significantly (P<0.05). In terms of rumen degradation, except GLB treatment, the effective degradation rate of ADF was not significantly improved (P>0.05), the effective degradation rates of DM, CP, ADF and NDF in other treatments were significantly increased (P<0.05). Compared to CK, the pH, the number of yeasts and aerobic bacteria in all treatments were significantly reduced after 6 days of aerobic exposure (P<0.05), and FLB treatment was the best. Using to the membership function method, the treatments were ranked: GLB (0.76)>LB (0.53)>FLB (0.52)>CK (0.14). In conclusion, LB, GLB and FLB treatments had positive effects on nutrient composition, fermentation quality, rumen degradation rate and aerobic stability of alfalfa silage, and the GLB treatment performed better than other treatments.

Key words: Lentilactobacillus buchneri, alfalfa, fermentation quality, rumen degradation rate, aerobic stability