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https://doi.org/10.5713/ab.22.0232    [Accepted] Published online November 14, 2022.
Antifungal and carboxylesterase-producing bacteria applied into corn silage still affected the fermented total mixed ration
Dimas Hand Vidya Paradhipta1  , Myeong Ji Seo2  , Seung Min Jeong2  , Young Ho Joo2  , Seong Shin Lee3  , Pil Nam Seong3  , Hyuk Jun Lee2  , Sam Churl Kim2,* 
1Department of Animal Nutrition and Feed Science, Faculty of Animal Science, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
2Division of Applied Life Science (BK21Four, Insti. of Agri. & Life Sci.), Gyeongsang National University, Jinju 52828, Korea
3Animal Nutrition and Physiology Division, National Institute of Animal Science, RDA, Wanju 55365, Korea
Correspondence:  Sam Churl Kim, Tel: +82-55-772-1947, Fax: +82-55-772-1949, Email: kimsc@gnu.ac.kr
Received: 13 June 2022   • Revised: 1 August 2022   • Accepted: 25 September 2022
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: Antifungal Substance; Carboxylesterase; Corn Silage; Fermented Total Mixed Ration; Microbial Inoculant
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