If you are wanting to get your cows where they calve close, and you are using a bull, how many cows can he handle within this limited time frame? If you used lutalyse on all of them, bringing them in at the same time, there must be a limit of cows he can service productively. If you use this method on different lots of cows, how many lots could the bull handle per year. For example: 10 cows per lot brought in at same day (one lot) and the bull could do four lots a year without risking his health? I am not sure how this could be broken up. What is the amount of time between lots that the bull should rest?