I use it 30 days prior to AI date at the same time I vaccinate, then the calves at weaning, I should give the cows another dose about mid Aug, I just cant find the time right then, but getting them bred is my main goal.
I have no documentation that it helps anything, I cull on fertility and the only things ive culled in the last few years are recips that probably dont deserve being culled, but thats my program. Just in my mind it makes sense I know they have what they need to help with breeding, if I get one more conception with it, its paid for.
I pay $182 for 500ml thats .364 per ml most of mine average 1400lbs at 7ml per so about $2.51 per head, the cost is the same for a 7wt calf.