NutreBeef Beef Tub 24% is formulated for beef cattle fed on a free-choice basis while grazing pastures with adequate forage, receiving silage, hay or green-chop. This block is fortified with major and trace minerals and vitamins and contains 24% protein to aid in the prevention of deficiencies. The weatherproof tub protects the supplement from weather and no additional feeder or protection is needed. Southern States Traditions 24% Beef Tub is best used in the fall, winter and spring.