Chickens will not always fatten up on feed alone. You can supplement what you give the chicken to help it fatten up more. Cracked corn, whole wheat and soy can be fed to chickens throughout the day. These items help to pack on the weight.Click to see full answer. People also ask, what puts weight on chickens?If you really just want to “fatten” them up for market, most people feed corn. It’s a high sugar/starch grain that when fed in volume can actually “fatten” chickens up, but that’s kind of cheating and not healthy for the birds.Also Know, can chickens get fat? But modern broiler/breeder chickens don’t adequately balance their feed consumption to match their energy requirements. When these birds are given unrestricted access to feed, they will overeat and become obese. Obesity is a problem for many American consumers—and now, even our chickens are getting fat! Also know, how can I fatten up my chickens in the winter? Be sure to give them plenty of treats too, like cracked corn, mealworms, and birdseed. Corn contains can fatten up your birds and mealworms provide a huge shot of protein. Just be sure not to overfeed them on treats, and just add this as a supplement to their normal food.What is a good diet for chickens?Select fruits, vegetables and grains will keep chickens happy and ensure they are receiving a nutritionally balanced diet. Good choices include leafy greens, cooked beans, corn, non-sugary cereals and grains, berries, apples and most other fruits and vegetables.