THE CONSTRUCTION OF POULTRY HOUSES 



175 



densation — ^that is, drops of water has formed on the walls 

 and equipment, which makes an unhealthy condition. With a 

 dry floor and plenty of head room and ventilation there will 

 be a dry condition, and the water of condensation will not be 

 noted. In cold countries, by the substitution of muslin for 

 the glass windows, it will be found that with other conditions 

 being correct there will be no water of condensation form and 

 the building will be dry. 



Fig. 66. — A partial view of a poultry plant, showing at a a half monitor 

 house; b, two-thirds span house; c, a, shed roof house; d, an outdoor dry 

 mash hopper. 



As stated before, good ventilation is essential and that there 

 be no drafts on the birds. Birds contract colds if they are in 

 the draf c, and a bird with a cold will not-produce eggs. Plenty 

 of fresh air is essential to health of the birds. Proper ventila- 

 tion so as to ensure an exchange of air. Pure air means plenty 

 of oxygen, and foul air means a lack of the proper amount of 

 oxygen and an excessive amount of carbon dioxid or poisonous 

 gas that must not be allowed to accumulate. In Figs. 58, 59, 

 and 60 will be seen illustrated three principles of ventilation. 



