They are then moved to a building that can be open to the south. A modified facility is insulated and requires natural ventilation. The building temperature fluctuates with changes in outside temperature. The following section lists some characteristics of each of these housing facilities. For heifers less than 8 months of age, limit groups of 5 to 7 animals and provide 20 to 25 square feet per animal.
Loose housing consisting of covered, bedded resting area with an optional run are ideal for heifers.
Free stalls with a manure alley or properly designed slatted floors are also good for housing heifers. During the summer, wind currents provide the force for air exchange. Natural ventilation designs incorporate sloping ceilings and openings under the eaves and at peaks. Size of ridge openings increase as building width increases. Large sidewall panels permit cross ventilation during warm weather.