Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effect of microbial inoculants on fermentation quality and aerobic stability of sweet potato vine silage

  • Joo, Young Ho (Division of Applied Life Science (BK21Plus, Insti. of Agri. & Life Sci.), Gyeongsang National University) ;
  • Kim, Dong Hyeon (Division of Applied Life Science (BK21Plus, Insti. of Agri. & Life Sci.), Gyeongsang National University) ;
  • Paradhipta, Dimas H.V. (Division of Applied Life Science (BK21Plus, Insti. of Agri. & Life Sci.), Gyeongsang National University) ;
  • Lee, Hyuk Jun (Division of Applied Life Science (BK21Plus, Insti. of Agri. & Life Sci.), Gyeongsang National University) ;
  • Amanullah, Sardar M. (Biotechnology Division, Bangladesh Livestock Research Institute) ;
  • Kim, Sang Bum (Dairy Science Division, National Institute of Animal Science, RDA) ;
  • Chang, Jong Soo (Department of Agricultural Science, Korea National Open University) ;
  • Kim, Sam Churl (Division of Applied Life Science (BK21Plus, Insti. of Agri. & Life Sci.), Gyeongsang National University)
  • Received : 2018.04.02
  • Accepted : 2018.06.29
  • Published : 2018.12.01
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Abstract

Objective: This study was conducted to evaluate the effect of homo or hetero fermentative inoculants on fermentation quality and aerobic stability of sweet potato vine (SPV) silage containing Italian ryegrass hay as moisture absorbent. Methods: The SPV was harvested at 15% dry matter, mixed with Italian ryegrass hay at 1:1 ratio on a fresh weight basis, and chopped to 3 to 5 cm length. After then, the chopped forage mixture was ensiled into 20-L mini silos in quadruplicate for 7, 48, and 100 days after application of microbial inoculants at $1.2{\times}10^5$ colony forming units (cfu)/g of forage following: no inoculant (CON), Lactobacillus plantarum as a homo fermentative (LP), Lactobacillus buchneri as a hetero fermentative (LB), and mixture of LP and LB at 1:1 ratio as a combo fermentative (MIX). Results: The LP and MIX silages had lowest pH (p<0.001) on 7 and 48 days, while MIX and CON silages had greatest lactate concentrations (p<0.05) on 7 and 48 days, respectively. Acetate concentrations were highest (p<0.01) in LB and MIX silages on 7 days, and in LB silage on 48 days, while lactate to acetate ratios were lowest (p<0.001) in LB silages. The chemical compositions and nutrient digestibility of silage ensiled for 100 days was not affected by inoculants. On 100 days of ensiling, LB silage had lowest (p<0.01) lactate concentration and lactate to acetate ratio, but highest acetate concentration. Aerobic stability was highest (p<0.001) in LB silage followed in MIX silage. On contrast, LB silage had lowest (p<0.05) lactic acid bacteria and mold. Conclusion: The results indicated that application of LB solely had a better effect on aerobic stability than not only LP, but also MIX. However, LP application did not show beneficial effects from the viewpoints of fermentation quality and aerobic stability compared to CON.

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References

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