I have a couple of heifers that I want bred as spring calvers for next year. These heifers will be about 20 months at breeding time. I held off breeding them earlier because I didn't want to have calves in the winter. I also happened to pick up another heifer at an Angus sale a couple of weeks ago. She was part of their commercial herd, and she was listed as a "spring 2014" heifer. She was a nice sized/ looking girl, so I was hoping she was a Feb/Mar calf, but I found out later she is a May calf. I guess I shouldn't assume anything. I would like to breed her at the same time as the other two older heifers, but I'm not sure when to turn the bull in. Should I wait until she is about 15 months, or is it okay to go earlier. If so, is 13 months okay? The breeder says they breed at 12 months quite often and don't have many problems at all. The bull will be be going to work for the first time in his life. He is a Gelbvieh bull and had a 71 lb BW. He will be about 15mo himself when we turn him in. I'm interested in your thoughts. Thanks for the help.