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Functional Additives
Friday, March 16, 2007 10:32:24 AM
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Occurrence of mycotoxins in feed samples from Asia



The last report on the occurrence of mycotoxins was published in 2006 (1), generating immense interest among the feed industry.


In the current analysis, the occurrence of various mycotoxins in feed samples was found to be: aflatoxin total (16 percent), deoxynivalenol (48 percent), fumonisin B1 (46 percent), ochratoxin A (24 percent) and zearalenone (38 percent).


This report is based on about 800 samples analysed over a 12-month period from October 2005 to September 2006 for the major mycotoxins of interest, namely, aflatoxins total, zearalenone (ZON), deoxynivalenol (DON), fumonisin B1 (Fum), T-2 toxin and ochratoxin A (OTA).


The samples received were primarily from Asia. Again, the data were analysed from two perspectives, first by geographical regions where the samples were originally from, and second by means of commodity types.


Geographical regions were grouped as follows: North Asia (China, Japan, Korea and Taiwan), South-east Asia (Indonesia, Malaysia, the Philippines, Thailand and Vietnam), South Asia (primarily India) and Oceania (primarily Australia).


Sample types were classified as feed ingredients (such as corn, soymeal, wheat, rice and DDGS) and finished feed samples.


For the purpose of data analysis, non-detect levels are based on the detection limits of the test method for each toxin: Aflatoxins total < 4 µg/kg; Zearalenone < 32 µg/kg; Deoxynivalenol < 50 µg/kg; Fumonisin B1 < 100 µg/kg; T-2 Toxin < 125 µg/kg and Ochratoxin A < 2 µg/kg.


High Performance Liquid Chromatography (HPLC) methodology was used for the analysis of all mycotoxins except T-2 Toxin which was performed using Thin Layer Chromatography (TLC).


Interestingly, from the cumulative data seen, there were certain degrees of association between some mycotoxins and specific commodity types. For instance, in corn, 81 percent were found to be contaminated with Fum; for wheat/bran, DON was found in 79 percent of the samples; for corn gluten meal and DDGS, ZON accounted for more than 88 percent of the contamination.


Nevertheless, the data presented in the article are intended for information purposes only. For a detailed profile of mycotoxin contamination in various commodities, it is advisable to carry out the necessary analyses. Such valuable information shall then be incorporated into the total quality management system for the betterment of animal health.




(1) LJ Chin and LM Tan, 2006. Occurrence of mycotoxins in Asian feed samples. Asian Poultry (May 2006) and Asian Pork (June 2006).


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Article made possible through the contribution of Biomin.

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