Mealworms may turn infected wheat to feed
U of S researchers foresee worm-based niche market in the feed industry
Fusarium fungus contamination in wheat caused more than $1 billion in economic losses in Canada in 2016, affecting almost 80 per cent of Saskatchewan and Manitoba cereal crops and leaving farmers scratching their heads about how to dispose of tonnes of worthless wheat.
The potential solution discovered by University of Saskatchewan researchers for producers stuck with unsellable fusarium-infected wheat may actually put cash in the farmers’ pockets and open up a new, worm-based niche market in the feed industry.
“We want to help producers by making use of grain that is worth nothing and that no one knows how to dispose of safely,” said animal and poultry science professor Fiona Buchanan.
Buchanan and her master’s student, Carlos Ochoa, have found that yellow mealworms can eat wheat infected with the fungus, whose mycotoxins are harmful. The worms remain unaffected after eating the grain, regardless of the level of mycotoxins, which usually cause vomiting and abdominal pain in humans and affect the growth of livestock.
The fattened mealworms — the offspring of a flightless beetle — could be a new, nutritious source of protein for chickens or fish.
“Yellow mealworms are a safe, more sustainable and cheaper feed, and can eliminate a contaminated product from the environment at the same time,” Ochoa said.
Buchanan added that farmers usually bury or burn the contaminated wheat, but these are not great options. Burying the grain does not eliminate the fungus and it may spread to next year’s crops; burning it causes pollution, worsening the environmental impact.
Buchanan got the idea of using mealworms for wheat disposal after talking over coffee with a farmer friend, who referred to a small study that showed a few mealworms eating contaminated wheat.
Using 10,000 mealworms, Buchanan and Ochoa proved that, regardless the level of contamination in the wheat the crawlers ate, they always showed only 0.13 parts per million of mycotoxin in their bodies — well below recommended safety levels for animal consumption.
Ochoa, who presented his research at a U.S. conference last summer, said he and Buchanan bought a tonne of contaminated wheat from a farmer, then used a machine to concentrate the mycotoxin levels and fed it to mealworms.
If additional funding becomes available, Buchanan would like to test even higher toxicities to determine the threshold of the mealworms for consuming infected wheat and start trials on chickens by feeding them crawlers grown on contaminated wheat.
The project was funded by the Saskatchewan Agriculture Development Fund. If all goes well and if the researchers get approval from the Canadian Food Inspection Agency, their goal is to start a company selling worms to chicken farmers in four or five years.
This content from the University of Saskatchewan runs through a partnership with The StarPhoenix. Federica Giannelli is a graduate student intern in the U of S research profile and impact unit.
Yellow mealworms are a safe, more sustainable and cheaper feed and can eliminate a contaminated product.