Occurrence of mycotoxins and yeasts and moulds identification in corn silages in tropical climate

Journal of Applied Microbiology
B F CarvalhoR F Schwan

Abstract

This study was aimed to identify yeasts and moulds as well as to detect mycotoxin in corn silages in southern Minas Gerais, Brazil. Corn silages from 36 farms were sampled to analyse dry matter, crude protein, ether extract, ash, neutral detergent fibre, nonfibre carbohydrates and mycotoxins contents, yeasts and moulds population, pH and temperature values. The mycotoxins found in high frequency were aflatoxin in 77·7% of analysed samples, ochratoxin (33·3%) and zearalenone (22·2%). There was no significant correlation between the mycotoxin concentration and the presence of moulds. The pH was negatively correlated with ochratoxin concentration. Aspergillus fumigatus was identified in all silages that presented growth of moulds. Ten different yeast species were identified using the culture-dependent method: Candida diversa, Candida ethanolica, Candida rugosa, Issatchenkia orientalis, Kluyveromyces marxianus, Pichia manshurica, Pichia membranifaciens, Saccharomyces cerevisiae, Trichosporon asahii and Trichosporon japonicum. Another six different yeast species were identified using the culture-independent method. A high mycotoxin contamination rate (91·6% of the analysed silages) was observed. The results indicated that convention...Continue Reading

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Citations

Sep 14, 2019·Journal of Applied Microbiology·C L S Ávila, B F Carvalho
Oct 28, 2019·Current Microbiology·Tahar AmroucheAdeline Picot
May 28, 2019·Toxins·Carolina Santos PereiraJosé O Fernandes
Jan 14, 2021·Environmental Research·Carla ViegasSusana Viegas

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