ESSENTIALS OF A POULTRY HOUSE 165 



is especially necessary in the poultry house in winter, when 

 a considerable number of birds are kept closely confined to 

 their quarters week after week. Poultry are very active, 

 and have a high body temperature. In the course of a 

 day they exhale a lot of impure air, which is a poison. Hy- 

 giene demands that this be removed and replaced with pure 

 air laden with oxygen. This air breathed out is heavily 

 laden with moisture. The constant removal of this moisture 

 laden air by ventilation makes the house drier. Good venti- 

 lation in the poultry house is best insured by the liberal 

 use of muslin curtains in the front. If these are left open 



Crow-section of 

 a .shatter vpntflaior 



Cross- .section of a 

 -covered tramp 



Cupola ventilator, with trap-door to 

 control amount oi air pajxing through 



Rear ventilation. d<?jigncd 

 wpecially for ore in the jammer 



FIG. 91. Four ways of ventilating the poultry house. 



much of the time, the atmosphere will be almost as pure as 

 that out of doors. In snowy, wet weather and on very cold 

 nights these openings can be closed by frames covered with 

 light-weight muslin, which readily permits the air to pass 

 through. Slatted shutters resembling blinds are frequently 

 recommended for use in place of muslin curtains; these 

 should be hinged so that they can be thrown open when not 

 needed (Fig. 91). 



Ventilators in the back of the poultry house are desirable 

 for summer use, and, if constructed rightly, will help to keep 

 the house cool during the hot weather. Sometimes the 

 ventilation is by means of flues or pipes connected with 

 chimneys on top of the house. If of good design these 



