2018/09/17 · Expected Pig Growth Rates. Because a pig eats approximately 4% of its body weight per day, they require a number of essential nutrients to meet their daily needs, i.e., water, carbohydrates, fats, protein (amino acids), minerals, and vitamins. With a proper diet, expect weight gains of about 1.5 to 1.7 pounds per day up to approximately 110 pounds.