Vitamin E & Zinc: The Secret to Healthy Broilers in Crowded Pens

Chickens raised in tight spaces face serious challenges. When too many birds share limited space, their health suffers. Feed consumption drops and body weight gains stall. Carcass quality falls and profits shrink. Scientists studied how to fix these problems through better nutrition.

Researchers took 636 day-old Cobb chicks and split them into three groups based on crowding levels. Some groups had light crowding at 23 kilograms per square meter. Others faced medium crowding at 34 kilograms per square meter. A few endured heavy crowding at 39 kilograms per square meter. Each group also got either zinc or vitamin E added to their food at 100 milligrams per kilogram of dry matter.

Birds under heavy crowding showed clear signs of stress. Their bodies released stress hormones and their liver produced higher levels of a protective protein called HSP70. Antibody levels dropped. Specific immune signals like interferon-gamma and interleukin-1 beta decreased. Adding zinc or vitamin E changed the picture. These nutrients helped restore healthy growth rates. They boosted antibody production. They lowered stress markers. Profitability stayed strong even when birds were packed tightly together.

The best approach was giving chickens zinc at 100 milligrams per kilogram of feed. This allowed farmers to raise stocking density from 23 to 34 kilograms per square meter without losing productivity. Both zinc and vitamin E offered similar benefits for keeping birds healthy and productive. Farmers can now choose either nutrient to support their flocks under intense conditions.