avdpas77":1gfc28rk said:
Run of the mill farm horses have no problems with moldy hay, but
most people wouldn't dare give it to a a pure-bred horse.
Honestly, this might have more to do with the gamble than the show horses' hardiness--a "run of the mill farm horse" has a value of $500-800, and you may see them as relplaceable, while a "show horse" can be worth tens of thousands of dollars...not worth the risk to some. Much like the gamble you made with your meat pen--very sensible too I might add!--rather than your breeding stock.
As someone who used to bale their own hay, mold is caused by the combination of dampness and lack of air circulation. If you have one but not the other you are usually safe. It is both together that are the problem. And most moldy hay smells "off", musty, like grandma's attic, or basement, or something, not fresh and sweet. My nose usually told me before my eyes that the hay was no good, but you have to pay attention, not just chuck it in with out noticing.
If we were concerned that the new hay might be damp, we salted the bales as they were stacked. A quarter cup or so of rock salt sprinkled on each bale before stacking the next one, "like feeding chickens" my old farmer friend used to say. This helped to prevent mold growth. I thought that if you wanted a little insurance you could put some in the bottom of your container, rather than silica packets. It mostly shakes back out of the hay as you feed it and doesn't affect palatablity as far as I have noticed.
If it was totally dry, crispy dry, there is no reason you couldn't bag it and have it keep nicely, and the plastic tub should work great too, as long as you don't get it wet in there--like my kids will go open the grain barrels when it is raining and leave the lid off "just for a minute". Not good.
I use old feed sacks, stuff a few flakes in each sack to keep it contained, and store it in an unheated shed in my very damp climate. But it takes too much space--I will be looking for one of those lovely tubs in the future.
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I should also say the salt was really intended to prevent the enormous stack of bales from heating up like a giant compost heap and spontaneously combusting--we weren't actually that worried about a few moldy bales so much as loosing the whole barn in a fire--which is NOT going to happen if you are storing less than a ton!