The Angus or Hereford bull on Holstein heifers used to be a veary common practice for calving ease. Although the resultant offspring milk very wel, actaully too well, unless you're prepared to supplement them or you have really superb pasture, they don't do all that well as beef cows. We had a good number of that particular cross and used to put two or three extra calves on them as soon as they calved. The bull calves get docked at the salebarn, and even the 3/4 beef calves don't pay as well as straight beef calves, although they do pay better then Holstein calves.
dun