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Mycotoxin UK & Ireland wheat survey 2014

2014.12.02.

Mycotoxins are highly toxic secondary metabolic products of moulds. Mycotoxin producing moulds damage crops and can cause great economic losses at all levels of food and feed production. Moreover, many of the mycotoxins impair health, cause diseases and death in humans and animals which consume contaminated food or feed products. This year's continental European maize harvest has shown increased contamination with the mycotoxins deoxynivalenol (DON) and zearalenone (ZEN). The levels of both these mycotoxins in some samples of corn harvested in Eastern and Central Europe reached such critical values that it –would not be safe to feed that corn to sows and piglets and special care should be -taken also in dairy cows and calves. 

The NutriAd Mycotoxin Survey covers 55 samples from all over Great Britain and Ireland. More than 300 analyzes were conducted to test for the occurrence of the six mycotoxins most frequently found in agricultural commodities intended for animal production. The survey provides an insight into the incidences of aflatoxins (Afla), zearalenone (ZEN), deoxynivalenol (DON), T-2 toxin, fumonisin B1 (FB1) and ochratoxin A (OTA) across all regions of the UK and Ireland. All analyzed samples were wheat. Typically, wheat levels of DON and zearalenone tend to be lower in northern England and Scotland; moderate in western England, Wales and Ireland and highest in southern and south-eastern England. All samples (55) were collected almost immediately after the harvest and the probability that some storage mycotoxins will have developed (OTA) was low. Wheat samples were sampled directly from farms or animal feed production sites.

Sample providers were advised to follow the principles of good sampling (Richard, 2000). However, analytical personnel and/or laboratory staff were not involved and, therefore, did not influence any part of this procedure. All six mycotoxins were analyzed by liquid chromatography tandem mass spectrometry (LC MS/MS). For the purpose of data analysis, non-detection levels were based on the limits of quantification (LOQ) of the test method for each mycotoxin: AfB1 < 0.5 μg/kg; ZEN < 10 μg/kg; DON < 75 μg/kg; FB1 < 125 μg/kg; OTA < 1 μg/kg and T-2 toxin < 4 μg/kg.

Results

The results show that 22% of wheat samples were contaminated with DON and none of the samples contained AfB1. Only 2% of samples contained OTA and FB1 but this result was expected as it is well known that OTA is a typical storage mycotoxin and FB1 is preferably produced on maize. The average concentrations of all recovered mycotoxins were low while the highest concentration of DON found in one of the samples reached only 280 μg/kg. Although 9% of the samples contained T-2 toxin, a mycotoxin extremely toxic for poultry, its maximum concentration reached only 11 μg/kg and this level is negligible.

Table 1 – Mycotoxin contamination of wheat in UK

UK samples (n=55)

AfB1

DON

ZEN

T-2 toxin

OTA

FB1

% of positive

0

22

4

9

2

2

Average of positive [μg/kg]

0

148

20.5

7

3.4

126

Maximum [μg/kg]

0

280

28

11

3.4

126

 

Figure 1 – Percentage of positive samples (>LOQ)

Conclusion

The NutriAd wheat mycotoxin survey concludes that this year’s harvest of wheat in the UK and Ireland is of very good quality in terms of mycotoxin contamination . Based on the results of this survey conducted immediately after the 2014 harvest we believe that this years wheat crop in the UK and Ireland might be considered safe for inclusion into finished feed rations for all animal species.

Vigilance is always advisable however as cereals in animal feeds originate from many sources and some continental European cereals harvested in 2014 have been shown to be highly contaminated with mycotoxins. The last possible line of defense is the detoxification of mycotoxins in vivo. The addition of proven mycotoxin deactivators to animal feeds is a very common method to prevent mycotoxicosis and is an effective strategy to keep mycotoxin risk low under any and all conditions.

References

Richard, J., 2000. Sampling and sample preparation for mycotoxin analysis. Romer® Labs Guide to Mycotoxins. 2. Romer® Labs Inc., 1301 Stylemaster Drive, Union, MO, USA 63084-1156.