Cross breeder, both breeds have bulls that sire daughters with lots of milk and bulls that sire daughters with much less milk. Remember, that when it comes to milk there is such a thing as too much of a good thing. In areas with good rainfall and ample grass, producers typically can handle cattle with higher milk EPDs. However, areas with lower rainfall or less nutritious grass (i.e. fescue some of the year) producers tend to have more success with low to mid range milk EPD cattle.
Both breeds have reputations for producing fertile, good milking daughters. One Tarentaise breeder that I know feels that Tarentaise cows produce milk with more butterfat which aids in their heavier weaning weights. The one concern I would have with Tarentaise is that they have a reputation for being a bit more flighty, whereas Gelbvieh have a repuation for being more calm than most Continental breeds; however there are exceptions in all breeds.
Please also remember that not all Tarentaise or Gelbvieh bulls are heifer bulls, so select a bull with abover breed average Calving Ease EPD and a below breed average Birth Weight EPD.
Good luck on your adventure of seeking a new sire.
