I've posted before about my easy calving Bull, because my first year calving was such a nightmare for us. But, out of our current Bull, of 16 calves in two years I did pull one out of a small first time heifer this year. The first bull I rented, 3 yrs ago, threw huge calves, pulled one, lost one( born during the night, blame myself for not checking cows before I went to bed), and dropped a 28lbs heifer (?), Polled Herefords. So 20 calves, pulled 2, lost one. Easy calving bulls make all the difference, I agree 100% with The BullLady 1 in 20 sounds right.
Alan