Have found that all types of apples, big and small, are best just cut in half as if you chop them in a bucket with a spade, as I used to, they go to pulp and last 5 mins because they just decomposed too fast or birds carried the bits away.
The idea of a feed station is that every time deer visit there is something for them, that way they will keep on coming back.
I do my rounds so that I visit each feeder at least every three days to top up and the apples are nearly always cleared with lots of slots and churned up mud around the feeders.
Strangely this year there have been only bucks on my patch.
Willowbank