Incidence of Aspergillus Section Flavi and concentration of aflatoxin in feed concentrates for Cattle in Jos, Nigeria
Journal Title: Journal of Veterinary Advances - Year 2012, Vol 2, Issue 1
Abstract
Samples of two types of cattle feed concentrates compounded at the feed mill section of the National Veterinary Research Institute (NVRI), Vom, Nigeria were evaluated for incidence of toxigenic Aspergillus section Flavi. Aflatoxins in the feed were quantified by Thin-layer chromatography with fluorescent detection in order to determine the risk of aflatoxicosis to the cattle. Isolates of Aspergillus section Flavi were recovered from all analyzed feed samples at varying levels. A. flavus was predominant (>70%) in the feed samples and occurred as the only Aspergillus section Flavi member in the dairy feed type. The incidence of atoxigenic strains was significantly (P<0.05) higher than that of toxigenic strains in both feed types and exceeded 75% in each case. Aflatoxin B1 (AFB1), B2 and G1 were detected in the samples at varying concentrations. Aflatoxins contaminated more samples and in higher concentrations in the dry season than in wet season. The mean concentration of aflatoxins was significantly (P<0.05) higher in dairy concentrates than maintenance concentrates. About 92% of the concentrate feed samples for dairy cattle had AFB1 concentrations exceeding the stipulated 5 µg/kg maximum limit set by the European Union (EU) for dairy cattle. AFB1 concentrations in all samples of the maintenance feed concentrate were within the EU maximum acceptable limits of 20 µg/kg. This study has shown that the risk of aflatoxicosis is high in dairy cattle due to the high levels of AFB1 in the feed concentrates. This may affect the milk products obtained from the cattle due to biotransformation of AFB1 into AFM1.
Authors and Affiliations
I. E. Udom , C. N. Ezekiel , S. O. Fapohunda , Z. S. C. Okoye , C. A. Kalu
Keywords
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