I'm not sure. I don't know exactly what horse apples are, but up here in MA this, if you can found any kind of apple tree, you'll find the deer because there were no acorns this season.
I would venture to guess that the deer would eat any type of apple. Is there any sign around those trees?

If you mean what we call "crab apples" (small, cherry-tomato sized apples, sometimes yellow-red that are usually quite sour and tart). Yes they do eat them. Some strains of crabs keep their apples through the winter and can be a dynamite late-season (post-rut) food source.

If they are crab apples, i shot a deer eating them this year. They love them.

Around here in east texas horse apples are those big green brain looking things found around bodarc trees

I think those big brain looking things are hedge apples from the Osage Orange tree deergrower.

I've never seen deer eat the fruit of the Osage Orange tree, commonly called Bodark here in Arkansas.

the deer here in MN like pumpkins and all soft grasses

yeah i did the family thing and carved pumpkins and i took the seeds in the woods and they ate um up

UH...Where I grew up horse apples were the small round things horses left behind.... :-?

I asked about hedge apples (the green brain looking fruits from the Osage orange trees) in the midwest catigory. I am working in Tnn and asked if any thing ate them. Got one reply that said no because they are toxic.

I notice now that all the nuts and berries are gone the bushytails are starting to eat them. They were obviously there last choice in food. If the tree rats eat them seems that the deer would also