The Change in Microbial Diversity and Mycotoxins Concentration in Corn Silage after Addition of Silage Additives

Abstract

In our study the presence of bacteria, yeast, and microscopic fungi was evaluated. Three forms of corn silage were made including silage without additive, silage with microbial additive (lactic acid bacteria), and silage with nutritional additive (urea). Silage additives were applied to the matter within the recommended dosage, then the matter was ensiled into plastic bags and stored at a constant temperature. After 5.5 months of storage, average samples for microbial and mycotoxins analysis were taken. From microbiological points, the plate count agar method for enumeration of total count of bacteria, lactic acid bacteria, enterococci, yeasts, and microscopic fungi and mass spectrometry for microbiota identification were used. In total, 43 species of bacteria and yeasts and 6 genera of microscopic fungi were identified from all samples of corn silages. The most isolated species were Lentilactobacillus buchneri and Kazachstania exigua from bacteria resp. yeasts and Aspergillus and Penicillium from microscopic fungi. Mycotoxins were determined by HPLC-MS/MS and divided into two groups as regulated and emerging. In the corn silages only Fusarium mycotoxins were observed. All corn silages, regardless of the addition of the additive, were the highest in nivalenol content. Deoxynivalenol and beauvericin with the highest concentrations were present in silage with urea. Although the mycotoxins content of the variants changed, these changes were not statistically significant. In general, addition of lactic acid bacteria Lentilactobacillus buchneri and Lacticaseibacillus casei and urea as silage additives affect the microbial diversity; however, the hygienic quality of whole crop corn silage was not negatively changed.

1,2-propanediol in maize silages with nutrients measurement using nirs technology

“…Each of the groups consisted of an extensive set of 168 silage samples (Table 4), which testifies to a broad and standard starting base for each group. The addition of silage additives affects the presence of L. buchneri in maize silages (Mitrík et al, 2019;Kalúzová et al, 2022). We found very significant statistical differences (P <0.01) in the content of propanediol between the silage alternatives.…”

Characterization of mycotoxins and microbial community in whole-plant corn ensiled in different silo types during aerobic exposure

“…In addition, LAB could also promote a suitable environment for Kazachstania and Candida to multiply after aerobic exposure ( Wang et al, 2020 ). The accumulation of Fusarium -derived mycotoxins is caused by the metabolic activity of toxigenic strains of Fusarium genus, and AFB 1 is mainly produced by toxigenic Aspergillus species ( Kalúzová et al, 2022 ). However, the direct relationship between the Aspergillus and AFB 1 in WPCS was not found.…”

Molecular characterization of gliotoxin-producing Aspergillus fumigatus in dairy cattle feed

“…Aspergillus fumigatus was identified using both conventional and molecular methods. Although studies have supported the morphological identification of fungi to understand the evolution of morphological characteristics, traditional methods are frequently inaccurate at the species level and can be misleading d to hybridization, cryptic speciation, and convergent evolution [50][51][52][53].…”