I have two alpines I would like to breed for 2010 kids, but I am not sure if they will be heavy enough. They were both born late February, and come from somewhat slow growing and small mature size lines. According to my weight tape, they weight between 50# and 60# each. I know that is quite small. They should both only mature at about 120# tops. I would like them to weight at least 75# before I breed them. I don't want to wait till next year, as I am considering selling at least one of them as a FF. The lasted I would like to breed them is late November for late April kids. Do you think this will be ok?