👉 Hay fluid, also known as hay mold or moldy hay, is a type of fungal growth that can develop in hay when stored improperly, particularly in warm and humid conditions. This mold produces mycotoxins, toxic compounds that can pose serious health risks to animals consuming it. Symptoms of hay fluid exposure include respiratory issues, such as coughing and difficulty breathing, as well as gastrointestinal problems like diarrhea and decreased appetite. Preventing hay fluid formation involves proper storage in a cool, dry place and ensuring good ventilation to inhibit mold growth. If hay is suspected to be contaminated, it should be discarded and replaced with fresh, uncontaminated hay.