The invention relates to structures for rearing and breeding pigs out of doors, which can be delivered in kit form, and any of the constituent parts of which can be interchanged with a new part, and whose design allows airtightness and watertightness to be attained, which are suitable for this use. These structures are composed, for example, of two frames A and B, receiving cladding panels H and K, joined together by struts F and G. This framework thus constructed receives roofing L, held by anchoring parts 29. <IMAGE>
