Problems with decreased dry matter intake or lackluster milk performance may be due to mycotoxins within feeds. Mycotoxins can occur in corn, cottonseed and forages. If you suspect a mycotoxin problem in your herd, test the feed immediately.

Frank Galey, director of the Wyoming State Veterinary Laboratory, suggests taking a sample of the total ration, as well as sample from individual ingredients.

“It is critical to obtain a representative sample within a lot or bin of feed, but not mix samples between lots,” he says. Mycotoxins grow in “hot spots” within feed storage areas, so be sure to get a representative sample.