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https://doi.org/10.5713/ab.22.0150    [Accepted] Published online June 28, 2022.
Effects of sodium diacetate or microbial inoculants on aerobic stability of wilted rye silage
Yan Fen Li1  , Li Li Wang1  , Eun Chan Jeong1  , Hak Jin Kim2  , Farhad Ahmadi2  , Jong Geun Kim1,2,* 
1Graduate School of International Agricultural Technology, Seoul National University, Pyeongchang 25354, Korea
2Research Institute of Eco-friendly Livestock Science, Institute of GreenBio Science Technology, Seoul National University, Pyeongchang 25354, Korea
Correspondence:  Jong Geun Kim, Tel: +82-33-339-5728, Fax: +82-33-339-5763, Email: forage@snu.ac.kr
Received: 13 April 2022   • Revised: 12 May 2022   • Accepted: 20 May 2022
The primary goal was to identify the effectiveness of chemical or biological additives in delaying the deterioration of early-harvested wilted rye silage after exposure to air. Methods: Rye harvested as a whole plant at the early heading stage was wilted for 24 h. The wilted forage was divided into treatments including sodium diacetate (SDA) at 3 (SDA3) and 6 g/kg (SDA6), Lactobacillus plantarum (LP), L. buchneri (LB), or their equal mixture (LP + LB) at 1 × 106 cfu/g fresh matter.
After 60 d of conservation in 20-L silos, lactic acid was greater in LP and LP + LB silages than other treatments (102 vs. 90.2 g/kg DM). Acetic acid was greatest in SDA6 (32.0 g/kg DM) followed by LB (26.1 g/kg DM), and was lowest in LP treatment (4.73 g/kg DM). Silage pH was lower with microbial inoculation and the lowest and highest values were observed in LP and untreated silages, respectively. After 60 d, neutral detergent fiber concentration was lowest in SDA6 silages, resulting in the greatest in vitro DM digestibility (846 g/kg DM). Aerobic stability was longest in SDA6 (176 h) followed by LB treatment (134 h). Instability after aerobiosis was greatest in LP silages (68 h), about 8 h less than untreated silages. After aerobic exposure, yeast and mold numbers were lowest in SDA6 silages, resulting in DM loss minimization. Exhaustion of acetic acid and lactic acid after aerobic exposure was lowest with SDA6 but greatest with untreated and LP silages.


Treatment of early-cut wilted rye forage with SDA at 6 g/kg resulted in silages with higher feeding value and fermentation quality, and substantially delayed deterioration after aerobic exposure, potentially qualifying SDA at this load for promotion of silage quality and delaying aerobic spoilage of early-harvested (low DM) rye forage.
Keywords: Aerobic Deterioration, Silage Fermentation, Wilting, Winter Rye

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