Well I’ve typed my fingers to the nub searching on Google, trying to prove my point and I can’t. It seems that letting hay sit in a bale to cure for a 4 to 5 weeks is an, “old wives tale”.
Except that the end of May 2003, the rainiest year in 100 years here, I put up, on the home farm, 4700 bales total of first cutting, alfalfa, alfalfa-orchard mix and straight orchard grass hay. The highest moisture reading on any of the hay was 15%. It then proceeded to rain for 12 of the next 15 days. The hay’s temperature throughout this time was ambient. After 15 days the hay started to heat up!! After 3 weeks it was maw burnt. I talked to local folks around here that had the same thing happen to them that same year.
If my ability to see the future had been working better, I would have taken this correctly cured hay to the auction right off the wagons.
I submit that new, correct, low percentage moisture hay, goes through a phase in it’s curing when it is more susceptible then fully cured hay to external ambient moisture.
I have NO science to base this on other then my nose. I can smell new hay, hay thats only a week or two old. It smells, “green”. I was taught not to feed, “green” hay.
I’ve had hay that sweats a little on the first day in the barn then never again. I’ve had it sit for a week ambient, then sweat for a couple days, then cool right off. Very variable cutting to cutting, depending on the heat and humidity. But I’ve NEVER had it not sweat in the bale.
I’m just a hard head I guess, I’m still going to wait to feed new hay