Specific losses can vary according to the weather, the length of time hay is stored, and other conditions. Still, losses can be substantial, ranging from 10 to 50 percent or more. depending on weather conditions and the duration of exposure.
Moisture content, mold growth, and direct exposure to sunlight can contaminate the hay with toxins, degrade vitamins and other nutrients, or simply make the hay unpalatable to livestock. The extent of spoilage also depends on factors such as the hay's initial condition, how well it is stacked, and the climate.
