i kept my twin bulls that came from a purebred bull, and dam was also black baldy angus. the bulls are almost a year by end of july, and parents' structures are med to med-large frame. the question, being a twin, affects the potent fertility of the bull sperm since they are twin. i am planning to bred them with solid bcs scores and med-large angus cows that are proven that they have calved before. these cows are also purebred black angus. thank you for your kind and generous responses. uscangus................