from what I read some and asked a couple of kids in college classes about it seems the deer should need the phosphate.
And like many things, they hit the minerals when they need it and the same with protein
I have put out salt and mineral and they'll eat more sometimes, but its not doing them as much benefit.
Kind of like corn, they will eat it almost any time, but its not so good, but they will refuse protein at times.
So I just roll with whats needed, not what they seem to eat the most of if that makes sense.
Certainly the salt is what they are craving, but they really don't need much of.
