118 



Farm Poultry 



afforded by the doors and windows. Many ventila- 

 tors have been planned for poultry houses, but all 

 ventilators that are in continuous operation either 

 give too much ventilation during the coldest weather 

 or not enough during the warm, still days. As a 

 rule, they furnish too much ventilation during the 

 cold nights, and not enough during the sunny part 

 of the day. Any system of ventilation that will 



FIG. 41. A good ventilator. 



fully meet the requirements of the busy farmer or 

 poultryman must be simple and readily controlled 

 by the attendant. Ventilators are not needed in 

 the severest weather, but during the warm days of 

 spring and whenever the temperature is above 

 freezing point during the winter and early spring, 

 some ventilation should be given. Farmers and poul- 

 trymen should aim to ventilate their poultry houses 

 as they ventilate their own sleeping apartments. 



