uh oh....
this actually can hurt the deer if im not mistaken.
so during the winter, the deers natural gut microbiome dies off with the seasons changing, and they grow gut microbes that can digest bark and wood and twigs and such,instead of being more geared towards just grass and juicy foilage. hence OP noticing the deer eating juniper.
when you then feed the starving deer something rich like corn or apples, it can really mess up their digestive system.
think about someone whose lost in the woods for a month and starving. when you find them, you cant take them to mcdonalds and feed them 3 big macks when all they have been eating is non nutrient dense food, they will get sick.
maybe its not as extreme as the one post i ran across made it seem, but it was clear that feeding starving deer in the winter corn is a bad idea.
sorry to be a debby downer just thought ide pass it along