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首页> 外文期刊>Journal of Veterinary Advances >Incidence of Aspergillus Section Flavi and Concentration of Aflatoxin in Feed Concentrates for Cattle in Jos, Nigeria
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Incidence of Aspergillus Section Flavi and Concentration of Aflatoxin in Feed Concentrates for Cattle in Jos, Nigeria

机译：尼日利亚乔斯的牛饲料浓缩物中曲霉黄酮的发生率和黄曲霉毒素的浓度

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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.
机译：在尼日利亚Vom的国家兽医研究所（NVRI）的饲料厂部分混合了两种类型的牛饲料浓缩物的样品，评估了产毒曲霉部分Flavi的发生率。饲料中的黄曲霉毒素通过薄层色谱法和荧光检测法定量，以确定对牛黄曲霉毒素中毒的风险。从所有分析的饲料样品中以不同的水平回收了曲霉属黄酮的分离物。黄曲霉菌在饲料样品中占主导地位（> 70％），并且是乳制品饲料类型中唯一的曲霉科黄病毒成员。在两种饲料类型中，产毒菌株的发生率均显着高于产毒菌株（P <0.05），且每种情况均超过75％。在样品中检测到不同浓度的黄曲霉毒素B1（AFB1），B2和G1。黄曲霉毒素在干季比湿季污染更多的样品，且浓度更高。乳品浓缩物中的黄曲霉毒素平均浓度显着高于维持浓缩物（P <0.05）。约有92％的奶牛浓缩饲料样品中AFB1的浓度超过了欧盟（EU）规定的奶牛最大限量5μg/ kg。维持饲料浓缩物中所有样品中的AFB1浓度均在欧盟最大可接受限值20μg/ kg之内。这项研究表明，由于饲料浓缩物中AFB1含量高，奶牛发生黄曲霉病的风险很高。由于AFB1向AFM1的生物转化，这可能会影响从牛获得的奶制品。

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