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

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 samp...

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Bibliographic Details
Published in:Brazilian journal of microbiology 2018-10, Vol.49 (4), p.919-928
Main Authors: Variane, Augusto Carlos Favaretto, Santos, Fabiane Cristina dos, Castro, Fausto Fernandes de, Barbosa-Tessmann, Ione Parra, Santos, Geraldo Tadeu dos, Pozza, Magali Soares dos Santos
Format: Article
Language:English
Subjects:
Aflatoxins
Aflatoxins - metabolism
Animal feed
Animal Feed - analysis
Animal Feed - microbiology
Animals
Aspergillus
Aspergillus - classification
Aspergillus - genetics
Aspergillus - isolation & purification
Aspergillus - metabolism
Brazil
Cattle
Cattle feeds
Contamination
Culture media
Dairy
Dairy farms
Farms
Feed
Feeds
Fermentation
Food Contamination - analysis
Fungi
MICROBIOLOGY
Mycotoxins
pH effects
Research Paper
Silage
Silage - analysis
Silage - microbiology
Water activity
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Summary: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.
ISSN:1517-8382
1678-4405
1678-4405
DOI:10.1016/j.bjm.2018.05.005