Evolution of fungal population and mycotoxins in sorghum silage
| Autor: | Ana Mionetto, Agustina del Palacio, Lina Bettucci, Dinorah Pan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Fusarium Aflatoxin Mycobiota Silage Health Toxicology and Mutagenesis 030106 microbiology Aspergillus flavus Toxicology 03 medical and health sciences chemistry.chemical_compound Fumonisin Food science Sorghum biology Fungi Public Health Environmental and Occupational Health General Chemistry General Medicine Mycotoxins biology.organism_classification 030104 developmental biology Agronomy chemistry Penicillium Food Science Cladosporium |
| Zdroj: | Food Additives & Contaminants: Part A. 33:1864-1872 |
| ISSN: | 1944-0057 1944-0049 |
| DOI: | 10.1080/19440049.2016.1244732 |
| Popis: | Silage, one of the most important feed sources for cattle, is vulnerable to contamination by spoilage moulds and mycotoxins because ensilage materials are excellent substrates for fungal growth. The aim of this study was to identify the mycobiota of sorghum silages, to determine the presence of aflatoxins and fumonisins, and to correlate these results with physical parameters of the silage. A total of 275 samples of sorghum were collected from dairy farms in the south-west region of Uruguay were silage practices are developed. The presence of fungi was observed in all of the sorghum samples with values varying from 0.2 × 104 to 4085 × 104 UFC g-1. Significant difference were detected in the total number of fungi during the storage period; at six months there is a high risk of fungal spoilage. The most frequent genera isolated from sorghum samples were Penicillium (70%), Aspergillus (65%), Absidia (40%), Fusarium (35%), Paecilomyces (35%) and Alternaria, Cladosporium, Gliocadium and Mucor (30%). The toxigenic species most frequently found were Penicillium citrinum, Aspergillus flavus and Fusarium nygamai. Only two samples were contaminated by AFB1 with levels of 1 and 14 µg kg-1. Fumonisin was detected in 40% of freshly harvest samples with levels ranged from 533 µg kg-1 to 933 µg kg-1. The use of silo bags seems to be an effective tool to store sorghum. However, the presence of toxigenic fungi show that regular screening for mycotoxins levels in silages must be performed to avoid the exposure of animals to contaminated feed and the introduction of these compounds into the food chain. |
| Databáze: | OpenAIRE |
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