Bulletin of Animal Husbandry
Volume: 69 - Número: supl - Pg: III - Ano: 2012

Adriana Frizzarin, Thiago Pereira Motta, Thamires Martins, Livia Castelani, Heloisa Solda de Azevedo, Cláudia Rodrigues Pozzi

Occurrence of B1 Aflatoxin in diet and M1 Aflatoxin in bovine milk

Ocorrência de Aflatoxina B1 na dieta e de Aflatoxina M1 no leite de bovinos

Ensuring food quality is one of the principles of food safety. Food for dairy cattle may be contaminated by fungi of the genus Aspergillus, which produce aflatoxins. The B1 aflatoxin, when ingested by animals, is biotransformed in liver in several other toxic metabolites, including M1 aflatoxin which is excreted in milk. M1 aflatoxin has a carcinogenic effect, which the presence in milk poses a serious risk to public health because milk and dairy products are consumed mainly by children, pregnant women and elderly. The objective of this study was to detect the presence of B1 aflatoxin in feed supplied to dairy cows and the presence of M1 aflatoxin in milk. Samples were collected from complete diet (corn silage and concentrate) from a batch of 15 lactating cows from a dairy farm in the Campinas region. Two samples of diets were collected directly into the troughs in intervals of 24 hours at every 15 days, totalizing a period of 45 days. Milk samples of those cows were collected 24 hours after diet collection, directly from sample valves in the glass jars.. B1 and M1 aflatoxins were detected by the technique of High Performance Liquid Chromatography after extraction and purification on immunoaffinity columns. From the 40 samples of diets evaluated, 40% were contaminated with B1 aflatoxin, and the levels found ranged from 1.93 to 43.78µg/Kg. One sample showed result higher than the maximum recommended for grain and animal feed in Brazil (20µg/Kg). From the 75 milk samples analyzed, the presence of M1 aflatoxin was detected in 13.3% with levels ranging from 0.03 to 0.16µg/L, not exceeding the maximum permitted for marketing in the country of 0.5µg/L, however 80% of contaminated samples had values above the maximum permissible levels of 0.05µg/L, value found among countries with abundant milk production... The presence of aflatoxins highlights the importance of monitoring the production, the storage and the importance of handling food and ingredients intended for dairy cattle to prevent the presence of B1 aflatoxin and consequently, M1 aflatoxin in milk.

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