Brazilian Journal of Microbiology Brazilian Journal of Microbiology
Braz J Microbiol 2018;49:919-28 - Vol. 49 Num.4 DOI: 10.1016/j.bjm.2018.05.005
Food Microbiology
The occurrence of aflatoxigenic Aspergillus spp. in dairy cattle feed in Southern Brazil
Augusto Carlos Favaretto Varianea,1, Fabiane Cristina dos Santosb,1, Fausto Fernandes de Castrob,1, Ione Parra Barbosa-Tessmannb,, , Geraldo Tadeu dos Santosa, Magali Soares dos Santos Pozzaa
a Universidade Estadual de Maringá, Departamento de Zootecnia, Maringá, PR, Brazil
b Universidade Estadual de Maringá, Departamento de Bioquímica, Maringá, PR, Brazil
Received 19 October 2017, Accepted 17 May 2018
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.

Keywords
Feed, Dairy, Aspergillus
Braz J Microbiol 2018;49:919-28 - Vol. 49 Num.4 DOI: 10.1016/j.bjm.2018.05.005
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