Do not let dry cows eat the wrong ration.
Make sure that the dry cows at the feeding fence cannot eat the feed of the lactating cows.
Compared to the lactating cows, the dry cows need a ration with less energy but with enough protein, and a lot structure plus the for them necessary minerals, vitamins, and exercise!
That is a different ration than that of the lactating cows.
So stop feeding about two eating places earlier in the vicinity of the dry cows The fattest cows are already ready when you come near with the feed for the lactating cows.
Make sure that they cannot eat the richer ration, which is good for the lactating cows!