I'm gonna take some recent pictures this weekend and probably use him as a breeder for the other cows that are there but do not belong to me. I will have to work something out with the owner of the other cows if they are bred by my bull. I guess the only way to know is if any become pregnant because there is no other bull in the herd. They bring a bull in for that when the time is right. This bull I bought is just one of last years calves that for some reason avoided being cut. At what age will my bull become sexually active in this herd?