Denny , Holstein does add to a beef herd especially in milk and temperment, plus they are well marbled. I think grazing them would not be a problem as you would not have the same "type" that high end dairy producers need. They actually are quite hearty and thrifty if you are not pushing them to milk 100 lbs a day.

1/4 or even half Holstein would not be enough for me to worry about food consumption or frozen udders.