we have 30+ - birth weights from 65 to upper 80s, larger weights out of big crossbred cows - did not use on heifers but probably could depending on their breeding - lot of bone so be careful with clubby by-products - lots of vigor at birth and quite consistent - 1/2 to 3/4 Simmental calves with a better look than I expected - I have seen the bull, a rather impressive mature bull - lot more hip that most simmy bulls out there with good width of base - if he won't put guts and rib into your cows need to sell the cows and start all over - not a junk calf in the bunch - I think that we will use a lot more of him this year -