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Antifungal and carboxylesterase-producing bacteria applied into corn silage still affected the fermented total mixed ration

  • Dimas Hand Vidya Paradhipta (Department of Animal Nutrition and Feed Science, Faculty of Animal Science, Universitas Gadjah Mada) ;
  • Myeong Ji Seo (Division of Applied Life Science (BK21Four, Insti. of Agri. & Life Sci.), Gyeongsang National University) ;
  • Seung Min Jeong (Division of Applied Life Science (BK21Four, Insti. of Agri. & Life Sci.), Gyeongsang National University) ;
  • Young Ho Joo (Division of Applied Life Science (BK21Four, Insti. of Agri. & Life Sci.), Gyeongsang National University) ;
  • Seong Shin Lee (Animal Nutrition and Physiology Division, National Institute of Animal Science, RDA) ;
  • Pil Nam Seong (Animal Nutrition and Physiology Division, National Institute of Animal Science, RDA) ;
  • Hyuk Jun Lee (Division of Applied Life Science (BK21Four, Insti. of Agri. & Life Sci.), Gyeongsang National University) ;
  • Sam Churl Kim (Division of Applied Life Science (BK21Four, Insti. of Agri. & Life Sci.), Gyeongsang National University)
  • Received : 2022.06.13
  • Accepted : 2022.09.25
  • Published : 2023.05.01

Abstract

Objective: This study investigated the effects of corn silage as a source of microbial inoculant containing antifungal and carboxylesterase-producing bacteria on fermentation, aerobic stability, and nutrient digestibility of fermented total mixed ration (FTMR) with different energy levels. Methods: Corn silage was used as a bacterial source by ensiling for 72 d with an inoculant mixture of Lactobacillus brevis 5M2 and L. buchneri 6M1 at a 1:1 ratio. The corn silage without or with inoculant (CON vs MIX) was mixed with the other ingredients to formulate for low and high energy diets (LOW vs HIGH) for Hanwoo steers. All diets were ensiled into 20 L mini silo (5 kg) for 40 d in quadruplicate. Results: The MIX diets had lower (p<0.05) acid detergent fiber with higher (p<0.05) in vitro digestibilities of dry matter and neutral detergent fiber compared to the CON diets. In terms of fermentation characteristics, the MIX diets had higher (p<0.05) acetate than the CON diets. The MIX diets had extended (p<0.05) lactic acid bacteria growth at 4 to 7 d of aerobic exposure and showed lower (p<0.05) yeast growth at 7 d of aerobic exposure than the CON diets. In terms of rumen fermentation, the MIX diets had higher (p<0.05) total fermentable fraction and total volatile fatty acid, with lower (p<0.05) pH than those of CON diets. The interaction (p = 0.036) between inoculant and diet level was only found in the immediately fermentable fraction, which inoculant was only effective on LOW diets. Conclusion: Application of corn silage with inoculant on FTMR presented an antifungal effect by inhibiting yeast at aerobic exposure and a carboxylesterase effect by improving nutrient digestibility. It also indicated that fermented feedstuffs could be used as microbial source for FTMR. Generally, the interaction between inoculant and diet level had less effect on this FTMR study.

Keywords

Acknowledgement

This research was supported (Project No. 321083-05-1-HD040) by IPET (Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries), and Ministry of Agriculture, Food and Rural Affairs, Republic of Korea.

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