Prevalence and effects of mycotoxins on poultry health and performance, and recent development in mycotoxin counteracting strategies

Abstract

Extensive research over the last couple of decades has made it obvious that mycotoxins are commonly prevalent in majority of feed ingredients. A worldwide mycotoxin survey in 2013 revealed 81% of around 3,000 grain and feed samples analyzed had at least 1 mycotoxin, which was higher than the 10-year average (from 2004 to 2013) of 76% in a total of 25,944 samples. The considerable increase in the number of positive samples in 2013 may be due to the improvements in detection methods and their sensitivity. The recently developed liquid chromatography coupled to (tandem) mass spectrometry allows the inclusion of a high number of analytes and is the most selective, sensitive, and accurate of all the mycotoxin analytical methods. Mycotoxins can affect the animals either individually or additively in the presence of more than 1 mycotoxin, and may affect various organs such as gastrointestinal tract, liver, and immune system, essentially resulting in reduced productivity of the birds and mortality in extreme cases. While the use of mycotoxin binding agents has been a commonly used counteracting strategy, considering the great diversity in the chemical structures of mycotoxins, it is very obvious that there is no single method that can be used to deactivate mycotoxins in feed. Therefore, different strategies have to be combined in order to specifically target individual mycotoxins without impacting the quality of feed. Enzymatic or microbial detoxification, referred to as "biotransformation" or "biodetoxification," utilizes microorganisms or purified enzymes thereof to catabolize the entire mycotoxin or transform or cleave it to less or non-toxic compounds. However, the awareness on the prevalence of mycotoxins, available modern techniques to analyze them, the effects of mycotoxicoses, and the recent developments in the ways to safely eliminate the mycotoxins from the feed are very minimal among the producers. This symposium review paper comprehensively discusses the above mentioned aspects.

Keywords: analysis; detoxification; gut; immune function; mycotoxicosis; occurrence.

Figure 1.

Chemical structures of most prevalent mycotoxins. A: Aflatoxin B₁, B: Deoxynivalenol, C: Zeralenone, D: Ochratoxin A, E: Fumonisin B₁.

Figure 2.

Adsorption capacity of mycotoxin binder products of different origins at pH 3.0 and pH 6.5 on Aflatoxin. M: Mineral; OC: Organoclay; Y: Yeast.

Figure 3.

Adsorption capacity of mycotoxin binder products of different origins at pH 3.0 and pH 6.5 on deoxynivalenol (DON). M: Mineral; OC: Organoclay; Y: Yeast.