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Special consideration: brooding and winter housing.
Since poultry generally cannot be placed on range before 2-3 weeks of age, brooder housing is needed to keep the chicks warm and draft-free. There are many Extension publications available on small-scale brooder housing. Portable brooder house blueprints obtained from NDSU are enclosed.
Winter housing considerations are important for range layer flocks. Pastured-poultry field pens are generally not sufficient for winter housing-layers need access to an enclosed area. In winter, bales of hay can be added to the more substantial free-range housing and eggmobiles to provide bedding and help insulate the birds.
Salatin houses layers in a 20'x120' hoop house in the wintertime in Virginia (see enclosed article "Hoophouses"). Although the hoophouse is unheated, composting deep litter of woodchips or sawdust provides significant warmth (house temperature reaches about 70F even on cloudy days). Whole wheat is scattered on the bedding each morning to encourage scratching. With a density of 5 square feet per bird, the bedding is fluffed and tilled up as fast as the birds manure it. In the spring after the animals are removed, vegetables are planted in the composted bedding. With this system, egg production falls by only about 25%, and this is without supplemental lighting. (Salatin does not use artificial lighting. Lighting is a very significant factor in maintaining high egg production. Extension publications and small-scale poultry production books are good sources of information on lighting for pullets and layers.).
The Chicken Tractor describes the use of a strawbale house as temporary winter quarters-it can be dismantled every year if desired. Andy Lee and Patricia Foreman often attach their chicken tractor field pens to the strawbale house to provide a protected winter run. See the enclosed article "Build a Strawbale Chickenhouse" for another author's description of strawbale housing.