How long after the hay was cut until you took core samples? I wouldn't be happy with that ESC level for an IR horse. You also have the option to to take another sample after the hay has fully cured and have just the ESC test done. A single test is pretty low cost.
The problem with baled "damp" hay is the likely hood of it becoming "dusty" with mold spores and your horses breathing that in. Been there, done that. Horse developed heaves.
Bonnie Snodgrass 07-2016
ECIR Group Primary Response
White Cloud, Michigan, USA