Ventilation 



95 



working rule as regards air space or cubical con- 

 tents of the building. Under good average con- 

 ditions, 8 or 10 cubic feet per pound of live 

 weight will perhaps be quite satisfactory. The 

 amount of air space, of course, will depend upon 

 the ventilation, and also upon the sources of con- 

 tamination, aside from the fowls themselves. If 



Fig. 31. Poultry houses Cornell University. 



manure is allowed to accumulate and the litter 

 becomes damp, the air will become impure. 

 Other things being equal, it will become im- 

 pure sooner in small houses than in large ones. 

 The above rule as regards air space has given 

 good satisfaction under favorable conditions and 

 may be used in the absence of more definite infor- 

 mation derived from actual experience. 



