Backyard Chicken Keeping & Smallholder Handbook

Sizing Ventilation: Backyard coops need continuous, draft-free airflow. Settle open vent space at 1 square foot per 10 square feet of floor area. Place vents near the roof line above perches to clear ammonia, carbon dioxide, and humidity without creating direct cold drafts on roosting birds.

Predator Proofing: Do not use standard chicken wire to exclude predators—raccoons, weasels, and rats can tear it open. Install 1/2-inch galvanized hardware cloth over all vents, windows, and floor lines. Bury wire mesh 12 inches deep around the perimeter to prevent burrowing dogs or foxes.

Backyard laying hens require a minimum of 3.8% to 4.2% calcium in their daily diet to maintain eggshell deposition. Feeding standard grains or table scraps dilutes dietary calcium, leading to soft-shelled eggs or cage-layer osteoporosis. Provide free-choice **crushed oyster shells** or limestone grit in a separate feeder so hens can self-regulate calcium intake.

Bumblefoot: A localized staphylococcal pododermatitis caused by small cuts on the foot pad. Symptoms include a black scab on the foot pad, limpness, and swelling. Treatment requires soaking the foot in Epsom salts, applying chlorhexidine, removing caseous cores, and wrapping the foot in vet wrap.

Crop Impaction & Sour Crop: Crop impaction (blockage from straw or long grass) feels hard and swollen. Sour crop (candida yeast overgrowth) feels squishy, smells sour, and regurgitates fluid. Massage the crop with mineral oil, isolate the bird, withhold feed for 24 hours, and administer copper sulfate or apple cider vinegar water.