Internationally, the size of hay bales varies. Per Measuring Know-How, the most common hay bale dimensions (average) are: Small hay bales: Start at 18 × 35 × 14 inches (46 × 89 × 36 ...

To be more specific: Small squares to be 20% or less ... Sweating, in regard to hay bales, refers to microbial respiration, which will create heat and result in dry matter (DM) loss.