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Animal Health
Thursday, December 07, 2017 7:08:59 PM
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Mycotoxin survey for feed and feed ingredients in North-East and South-East Asia
 
Dr. Joanne Ho, Ph.D. (Joanne.Ho@kemin.com), product manager, and Hwee Ching Ong, senior CLS associate; Kemin Industries (Asia) Pte Ltd, Singapore.

 


Abstract
 

Kemin Industries (Asia) Pte Ltd conducted an extensive mycotoxin survey from August 2013 to March 2016 across nine countries in North-East and South-East Asia, namely Brunei, Indonesia, Korea, Malaysia, Myanmar, Philippines, Taiwan, Thailand, and Vietnam. The Singapore based, Customer Laboratory Services (CLS) received 147 samples of poultry and swine feed and feed ingredients for analysis to detect the presence of mycotoxins. The objective of this study was to identify the presence and contaminating level of mycotoxins in the finished feed and feed ingredients from these Asian countries. Mycotoxins such as Aflatoxin B1 (63%), Zearalenone (47%), Deoxynivalenol (63%), Fumonisin B1 (67%), and Ochratoxin A (2%) were detected in all feeding stuff. The survey was further classified according to mycotoxins prevalence, percentage of positive samples, and co-occurrence of multiple mycotoxins. The findings revealed co-contamination of mycotoxins in both the feed materials and feeding stuff from Asia and the mycotoxins detected were mainly Aflatoxin B1, Fumonisin B1, Zearalenone and Deoxynivalenol.

 

Introduction
 

Mycotoxins are toxic secondary metabolites produced by molds. Feeding materials can become contaminated with mycotoxins because of mold growth during harvest in the field or at storage. Mold growth can be classified as field molds and storage molds, and the main fungi families that can cause mycotoxicosis in animals are Aspergillus, Fusarium, and Penicillium.1 Compared to temperate climates, mycotoxins are more frequently found in hot and humid areas like the South-East Asia region where the environment is favorable for the growth of molds.2 Mycotoxins give rise to many different biological effects in animals such as toxicity in liver and kidney, defects in central nervous system and estrogenic responses that lead to lower animal performances. When mycotoxins are ingested at high or low levels, they may cause mycotoxicosis which can result in acute or chronic symptoms in animals. Acute mycotoxicosis can lead to death while chronic effects are linked with reduced feed intake, reduced growth and development, immunosuppression, cancer and other "slow pathological conditions".3 More than 500 mycotoxins have been identified, and five of them, specifically Aflatoxin, Deoxynivalenol, Zearalenone, Fumonisin and Ochratoxin were found to cause considerable deterioration of the animals' health which may result in high economic losses.4 This survey would discuss about the mycotoxins produced by the most significant species of the three genera in relation to feed safety.

 

Methodology
 

 

The CLS team performed mycotoxin recovery for five mycotoxins, particularly Aflatoxins (AFB1, AFB2, AFG1, AFG2), Deoxynivalenol (DON), Zearalenone (ZEA), Fumonisin B1 (FUM B1) and Ochratoxin A (OTA) on the 147 samples received.  A validated method based on High-Performance Liquid Chromatography (HPLC) was applied to investigate the occurrence of mycotoxins. Figure 1 shows the procedures of the mycotoxin analysis which involved an immunoaffinity extraction process in attaining a purified extract. The ZEA, FUM B1 and DON in the purified extract were detected using the High-Performance Liquid Chromatography with Mass Spectrometry detector (HPLC-MS). High-Performance Liquid Chromatography with a fluorescence detector (HPLC-FID) was used for AF and OTA detection. The first step involved an extraction process in removing the mycotoxins present in the feed samples. The extractant was passed through a clean-up column to attain a purified extract which was analyzed and quantified using the High-Performance Liquid Chromatography (HPLC). The detection limits of this method for each mycotoxin are AF<3 ppb, DON <20 ppb, ZEA <20 ppb, FUM B1 <50 ppb, and OTA <10 ppb.

 

Mycotoxin occurrence
 

Table 1 shows the mycotoxin analysis survey conducted on the feed ingredients and complete feed samples received from Asia. Fumonisin B1, Aflatoxin B1, and Deoxynivalenol were the most frequently occurring mycotoxins in the feeding stuff.

 

Table 1. Mycotoxin analysis results on the feed ingredients and complete feed samples received from Asia.

 

 

Survey results
 

In Asia, corn is one of the key ingredients in the production of animal feed. Tables 2A and 2B provide a detailed view of the total analysis, percentage of contaminated samples, mean and the maximum level on the key mycotoxins contamination level detected in corn and finished feed respectively.  AFB1, ZEA, DON and FUM B1 were detected in both corn and finished feed, with the latter having much higher positive samples. OTA was not detected in the corn and finished feed samples received.  This study showed that FUM B1 contamination of finished feed is not only more frequent but also accompanied by higher contamination level as compared to other mycotoxins. For the corn samples, the most prevalent mycotoxin detected was ZEA, which has an average of 127 ppb and maximum levels of 527ppb.

 

Table 2A. Raw materials (Corn)
 

 

Table 2B. Finished feed
 

 

Table 3 shows the maximum mycotoxin levels detected in feed ingredients by commodity (corn and soya bean) and complete feed (swine, poultry, duck). Regarding commodity, corn samples were found to reach high contamination levels of mycotoxins like AFB1 (147 ppb), and ZEA (527 ppb). There is a high natural occurrence of deoxynivalenol in soybean, with the highest concentration value of 1107 ppb detected in the full-fat soya and an average detection level of 758 ppb recovered. Swine feed contain highest ZEA while poultry feed has the highest DON and FUM. These 3 mycotoxins are recognized to be most commonly found mycotoxins that associated economic loss. Of all, pigs are known to be most sensitive to Zearalenone which can affect their reproductive system.

 

Table 3. Maximum mycotoxin levels detected in the different feed ingredients and feed samples.

 

 

Maximum action and rejection limits of different mycotoxins – Guidelines by GMP+ (Good Manufacturing Practices+)

No amount of mycotoxin can be considered safe. At times only a few mycotoxins are analyzed, and the presence of one mycotoxin may suggest the presence of other mycotoxins. The GMP+ Feed Certification scheme integrates the requirements for quality management system (ISO 9001) and HACCP to ensure compliance in keeping mycotoxin levels below specified limits to produce safe feed. Maximum permissible limits of mycotoxins in animal feed (as seen in Table 4) were established based on the recommended regulatory limits imposed by the European Community in 2006/576/EC and the guidance value in 575/2011.

 

The maximum permissible limit for Aflatoxin B1 is 5 ppb for young animals and 20 ppb for mature animals such as poultry and pigs. Low permissible limits were set for Aflatoxin B1 because it is an undesirable toxic substance that poses potential dangers to animals' and humans' health. Of note was the finding that majority of the complete feed samples which were tested positive for Aflatoxin B1, had contamination values exceeding the EU recommended permissible limits of mycotoxins in young monogastric animals.

 

Table 4. Maximum action and rejection limits of different mycotoxins as per the guidance value by GMP+

 

 

Co-occurrence of mycotoxins

 
Co-contamination of mycotoxins can cause adverse effects on animals as the interactions can be additive or synergistic. The complexity of mycotoxin interactions can vary according to the animal species, the type of mycotoxins, the level of contamination and the length of exposure.
 

Figure 2 shows the percentage of mycotoxins detected and co-occurring in the samples received. 82% of the samples analyzed were contaminated with at least one mycotoxin. The high percentage of samples at 43% that contained three or more mycotoxins was a concern. The high occurrence of multiple mycotoxins co-occurring in the feed and feed ingredients can pose adverse effects to the animals' health due to possible interactions of the mycotoxins, which may exaggerate the toxicity symptoms in the animals' body.


Figure 2. Co-occurrence of multiple mycotoxins in the samples
 

 
Maize and complete feed for poultry and swine that have contamination values above the permissible limit were evaluated for the co-occurrence of mycotoxins. In general, the highest co-occurrence rates recorded were the complete feed samples for poultry and swine due to the combination of various contaminated feed ingredients. As the incidence of Aflatoxin B1 in Asia's feeding stuff is high, the most frequently co-occurring mycotoxin combinations found in complete feed for poultry were Aflatoxin B1 + Fumonisin B1 and mycotoxins found in feed for swine were Aflatoxin B1 + Zearalenone and Aflatoxin B1 + Deoxynivalenol.

 

Figure 3. % Co-occurrence of mycotoxins in feed ingredients and complete feed for poultry and swine.

  

 
Conclusion
 
The three-year survey indicated that the feed ingredients and finished feed were contaminated with mycotoxins (secondary metabolites of molds). In Asia, AFB1, ZEA, DON, and FUM B1 were present in more than 50% of the finished feed and co-occurred in majority of the samples. Effective prevention and control measures must be implemented to reduce the risk of mycotoxin formation in the field and during storage. Mold inhibitors can be incorporated to prolong the stability of the feed and feed ingredients during storage. In addition, a broad-spectrum mycotoxin binder can be a comprehensive solution to reduce the toxicity risk of mycotoxin co-occurring in the feed samples from North and South-East Asia.
 

*Dr. Joanne Ho, Ph.D. (Joanne.Ho@kemin.com) is Product Manager and Hwee Ching Ong is Senior CLS Associate with Kemin Industries (Asia) Pte Ltd, Singapore. A list of references is available on request from the first author.

 


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Article made possible through the contribution of Dr. Joanne Ho, Ph.D, Hwee Ching Ong, and Kemin Industries (Asia) Pte Ltd, Singapore

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