An ol' timer told me once that black bulls (I'm assuming he meant angus or brangus) like to do their business at night. One of the brangus bulls we have now doesn't care. A couple of months ago I brought my 7 year old daughter to check the cows with me. It was late in the evening. I didn't notice, but she screamed out, "Dad, that bull is trying to kill that cow!" " What's he doing on top of her?" Not wanting to just throw this back at my wife, I sat out there with her for about an hour talking to her about it. The funny thing was that the whole time we were talking, that bull was trying to earn his keep. Now she laughs and says, "Dad, the bull is breeding number 11, you need to write that down."