20 lbs.: 1.00 cups-day 40 lbs.: 1.75 cups-day 60 lbs.: 2.50 cups-day 80 lbs.: 3.00 cups-day 100 lbs.: 3.50 cups-day. 20 lbs.: 1.00 cups-day 40 lbs.: 1.75 cups-day 60 lbs.: 2.50 cups-day 80 lbs.: 3.00