Heating is most likely to damage hay stored at moistures above 30%. Minimum changes occur if it is baled at 20% or less although if it is uniformly dry it can be baled and stored safely at 25%. The 25% level is the average moisture in curing hay at which it is dry enough overall to avoid moulding or hot spots that occur with variations in moisture content that are usually at higher average moisture. Large square bales need to be baled at a lower moisture content than small square or round bales.
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