United Animal Health Coronavirus (COVID-19) Statement: Read Here

Summer Heat Means More Mycotoxins

You can’t control the weather, but you can mitigate your mycotoxin risk.

Unfavorable weather conditions such as high temperature and moisture allow the natural substances produced by molds to proliferate and produce mycotoxins.

Your existing corn takes on more moisture from the humidity, while the corn in the field is also collecting water. Your sampling may not show an accurate depiction of how much mold is actually in your bins.

Contaminated feeds contaminate profit

Mycotoxins produced during grain storage contribute to an increased pathogen load for your animals in the late summer months. The symptoms from eating contaminated feed can be varied and sub-clinical. Even low mycotoxin levels in feed can reduce performance and profits.


Reduces feed intake and absorption of nutrients

Reduces body weight gain

Impacts overall health status of pigs



Heat Stress + Mycotoxins = Pathogen Playground



Heat stress occurs when pigs are unable to regulate their internal temperature. This causes a decrease in performance and health, even death in severe cases. As the body diverts blood away from the gut and toward extremities, gut integrity is lost. When continuously exposed to heat and humidity, the gut continues to degrade, making it easier for pathogens like E. coli to take hold. It can take as little as two hours for the gut to show the effects of heat stress.


In the summer, as bins begin to empty to prepare for the new crop, the prevalence of mycotoxins, often associated with cracked or damaged grains found at cleanout, often increase. Fumosin is the most dangerous mycotoxin to gut integrity. As grain bins empty and fumosin potential increases, so does the prevalence of E. coli.


The combination of heat stress and mycotoxins can result in significant impacts to gut health, namely the destruction of the intestinal lining. Once the damage occurs, pathogens proliferate and colonize, creating intestinal turmoil. Understanding the source of gut issues – whether they be from heat stress, mycotoxins or a combination of the two – will guide your specific solution.


You don’t have to lose performance during late summer.

Find your mycotoxin mitigation strategy here.