I'm looking to buy a new bull for the first time. I keep seeing the weaning weight on the EPD's and there seems to be a big gap in the weights. Some are in the 500's others are in the 800's. Is there a set time period? I've seen on some breeders list a 205 day and a 225 day wt. Is this their weaning weight? By the way the bulls are charolais if that makes a difference.