Re: ? about hot hay

Posted by kyhayman on May 26, 2006 at 22:00:32 from (68.171.76.92):

In Reply to: ? about hot hay posted by John/Pa on May 25, 2006 at 18:57:20:

Heating is caused by microbial growth, nothing more, nothing less. As soon as hay is baled, bacteria and fungi begin to colonize grow until such point as the bales lose enough moisture that dryness alone will stop the process.

Water source doesnt matter. Dew moisture on dry hay will raise the stem moisture through osmosis, but gravity and air flow normally causes this to not be an issue. I check temps of hay in storage at least daily for a month. A rise of up to 120 degrees is ok for cow hay, it will be dusty but not ruined.

You mentioned it was molding on day two? I'm curious.... I rolled some May 5 for wrapped round bale silage and didnt finish wrapping until the next day. It was raining (light rain) when I baled it and was unwilted, at wrapping temps were still under 140 and there was no visable mold. For it to be that hot and already molded something has to be going on. Fog perhaps? Super tight stacks? I have had round bales heat in the barn to the danger point even when I 'knew' they were dry.

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