Hay doesn't get eaten
 

Probably a very stupid question but my horses, who live out 24/7 seem to not eat their hay once it's been in the field for a while. It's perfectly fine hay, but they seem to prefer the fresh one I give them. Like there's hay out from the beginning of the week which looks fine - but they ignore it and then hoover up the hay I brought them this morning. Is it like with other animals and they'll eat it if they're really hungry or are horses different? I don't want to waste hay by topping up too much but obviously I also don't want to starve them. Thank you.

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