we had all unassisted births out of first calf heifers, calves grew good and had HAIR!!!! O0 had plenty of style too.....noticed that ours (2/5) had health issues seemed to be a little weaker immunity thatn rest of our herd. dont know if thats genetic or poor luck... all calves were treated equally and hose 2 seemed to need a touch more attention and have always acted a little "slow"