The occurrence of aflatoxigenic Aspergillus spp. in dairy cattle feed in Southern Brazil

Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]
Augusto Carlos Favaretto VarianeMagali Soares Dos Santos Pozza

Abstract

The presence of mycotoxins or related fungi in animal feed is a major problem for animal and human health. Silage and concentrated feed samples were collected from 21 dairy farms in the Western part of Paraná state in Southern Brazil. Water activity and pH of all samples were measured, and each sample was analyzed to check for the presence of aflatoxigenic Aspergillus. Water activity was observed to be lower in the concentrated feed samples. The pH was lower in the silage samples, indicating fermentation processes. Two silage samples and four concentrated feed samples were contaminated with Aspergillus spp. Seven isolates of Aspergillus spp. were obtained and their potential to produce aflatoxins was evaluated. Four of the isolates, two from the silage samples and two from the concentrated feed samples, produced the aflatoxins B1, B2, G1, and G2 in culture media. These isolates were identified as Aspergillus parasiticus and Aspergillus nomius. The presence of aflatoxigenic isolates of Aspergillus spp. in silage and concentrated feed samples is a matter of concern, because of the risk of aflatoxin production and contamination of the animal feed.

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Citations

Jan 11, 2020·Frontiers in Microbiology·Ferenc PelesIstván Pócsi
Feb 9, 2021·Frontiers in Microbiology·Nancy NleyaMulunda Mwanza
Mar 5, 2021·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Clarisse J de MatosHemerson I F Magalhães

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Methods Mentioned

BETA
PCR

Software Mentioned

Geisen
SAS
MEGABLAST

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