Heating is caused by respiration of fungi able to grow at temperatures in this range. The loss in digestibility is greater at these temperatures than at lower temperatures. If the temperatures continue to rise and heat is not dissipated from the storage site, a dangerous condition may develop. Continue to check the temperature every few hours. Notify the fire department that you have some very hot hay and work with them for recommendations for further action.
Spontaneous combustion is possible.
Do not attempt to move hay without fire department assistance. Consult your veterinarian about the adverse feeding effects of moldy hay on livestock, but, in general, horses are more sensitive to moldy or musty hay than are cattle or sheep. Mold and musty odors are often a factor in the marketing and pricing of hay that is bought and sold. This information subject to a usage policy .