Here in the big woods of Pa we have lots of oaks,White,Red and others.
Huntsman is right in saying the red acorns are more bitter than white acorns.Deer definately like the white acorns better and will feed exclusivly on them when the time is right.That time is usually when the snows fall and most of the green grasses are gone.
Deer will feed on grasses,and clover for as long as they can.When that is not available they will head for alternative foods.A favorite here in the nor-east is beech nuts.If there is a good beach nut crop the deer will work on that for as long as possible.The problem we have is alot of times if we get a late frost in spring ,that kills the acorn or beechnuts.We cant even tell until fall if there is any mast crop for the season.We havent had any white oak now for 3 years,this year included.Red oaks seem to be more tolerable to these cold spring frosts.Last year we had loads of red oak,but no white oak.We had no beechnuts last year and a sparse crop this year.I have seen some years that there were so many white oak acorns the ground was covered.
These ups and downs are normal and mast crops are on up or down year cycles.Some areas Do have acorns,but most times it is more in the southern warmer part of the state that has warmer springs.
Luckily deer have a wide selection of food that they can turn to in down years although a good mast crop certainly helps.