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This study was conducted to evaluate the effect of lactic acid bacteria (LAB) on fermentation quality, mycotoxin concentrations, and microbial communities of whole-crop corn silages infested with mycotoxigenic fungi. Cultured spores (10 6 cfu/mL) of mycotoxigenic Aspergillus flavus and Fusarium graminearum were sprayed (5 mL) on corn forage on 27 July and 10 August 2018. On 21 August 2018, sprayed (FI; 3 plots) and unsprayed (NFI; 3 plots) corn forage were harvested at the 1/2 kernel milk line stage, followed by chopping and ensiling without inoculants (CON), or with Lactobacillus buchneri (LB, 1 × 10 6 cfu/g FW), Lactobacillus plantarum (LT, 1 × 10 6 cfu/g FW), or L. buchneri + L. plantarum (BT: both L. buchneri and L. plantarum applied at 0.5 × 10 6 cfu/g FW). After 90 d of ensiling, FI silages had a higher ( p &lt; 0.05) pH value and higher acetic acid (ACA), ethanol, and ammonia nitrogen (ammonia N) concentrations, but lower ( p &lt; 0.05) lactic acid (LA) concentrations than NFI silage. The inoculants decreased pH and increased LA concentration and LA/ACA compared with CON. The aflatoxin B 1 (AFB 1 ) was only detected in FI fresh corn and silages; ensiling decreased ( p &lt; 0.05) AFB 1 concentration compared with fresh corn, and LB and BT decreased AFB 1 concentration compared with CON. The zearalenone (ZEN), deoxynivalenol (DON), and fumonisin B 1 (FB 1 ) concentrations were similar ( p &lt; 0.05) for NFI silages, while ZEN concentration in BT was the lowest ( p &lt; 0.05) among all FI silages; DON and FB 1 concentrations in LB, LT, and BT silages were significantly lower ( p &lt; 0.05) than those of CON in FI silages. The fungal infestation increased the bacterial and fungal diversity of silages compared with NFI silages. The FI silages had a higher relative abundance (RA) of Lactobacillus , Weissella , Wickerhamomyces , Pichia , and Epicoccum than the corresponding NFI silages. The RA of Aspergillus and Fusarium markedly decreased after 90 d of ensiling, and the inoculation expanded this trend irrespective of fungal infestation. The Penicillium in FI silages survived after 90 d of ensiling, while the inoculants decreased the RA of Penicillium . Inoculants mitigate the adverse effects of fungal infestation on corn silage quality by changing the bacterial and fungal communities.

Effect of Lactic Acid Bacteria on the Fermentation Quality and Mycotoxins Concentrations of Corn Silage Infested with Mycotoxigenic Fungi