Cows...100% +1 in 54 days. Actually +2, but the cow that had raised twins before, rejected one of hers...gave it to a neighbor.
First calf heifers and two year old heifers...50-60%. They run with the cows...no special treatment. First calf heifers get their only chance if they did a good job on their first calf, have a good phenotype, and family history. Two year old heifers become meat...unless I really like their phenotype and have family history, but this will happen only as long as I'm trying to increase herd numbers.
This is on 100% forage/hay and water...no feed, no minerals, no pesticides, no vaccines. I use bulls I raise and almost all cows are home grown coming from genetics that go back to a herd that was closed in the late 1930s. The hand full of cows I've bought in the last 7 years go back to the same herd.
"And at the end of the day, the 'cow' business is what we are engaged in, isn't it?" Lorenzo Lasater