Why is the feed's structural fiber level critical to prevent feather pecking and vent cannibalism in cage-free brown layers?

Feather pecking and vent cannibalism are severe behavioral vices in cage-free housing systems, especially among highly active brown breeds like Lohmann Brown. These vices often stem from gut discomfort or lack of satiety. When hens are fed highly concentrated, low-fiber diets, they consume their feed quickly and have excess idle time. Furthermore, their digestive tract moves the fine feed rapidly, causing hunger pangs. Incorporating insoluble structural fiber—such as oat hulls, sunflower meal, or coarse wheat bran—at levels of 3.5% to 4.5% stimulates the muscular development of the gizzard. A large, active gizzard slows down gut transit time, maintaining a steady release of nutrients and prolonging the feeling of satiety. This natural digestive comfort keeps the birds occupied with normal digestion, drastically reducing feather pecking, skin lesions, and mortality. Farmers can calculate fiber balancing formulas in the Poultry Encyclopedia, check raw wheat bran and sunflower rates on Poultry Rates, buy feed pre-mixes on Poultry Plaza, and trade premium-grade stock on Murghi Mandi.