Since the 1.17.41 update, all the animals in my farm can't be fed/enter love mode. They will still follow, and any newly generated animals can be bred, but not pre-existing ones.
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have you tried moving them? my horses entered love mode but were'nt breeding. they only bred after i moved them.

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Basically, the "use" command doesn't work on an existing animal. Can't milk cows either.