At 650, while he is still somewhat small, I wouldnt really classify him in the at risk category. More like 400-500 gram guys are ,ore in danger. Some good ideas would be to limit the number of girls, and give him plenty of breaks. I will be breeding a male who is 525-550 grams this year. He is an 06. Im going to be careful, but he is only breeding one female so Im not really worried. If I was, he wouldnt be breeding!!!