Equipment 377 



Because they require no glass and lighter framing, the 

 colony houses are the less expensive in first cost. 



With the centralized house, the danger of disease 

 spreading through the herd is greater, once it enters, than 

 when colony houses are 

 used. It should, there- 

 fore, be planned with 

 sanitation and easy dis- 

 infection constantly in 

 mind. Sanitation in- 

 volves light, ventila- 

 tion, cleanliness, and Fig. 33.- T^^^T^" Hog House. 

 pure-water supply. 

 The method of ventilation depends on the climate. If 

 the climate is severe, greater precaution will be neces- 

 sary in admitting fresh air and permitting the exit of 

 the stale air, while if the temperature is habitually 

 higher, very little system is necessary in securing 

 good ventilation. A hollow shaft leading from the 

 floor through the roof will permit the exit of stale air 

 from the bottom ; and an intake under the eaves with 

 a shaft opening just under the comb will admit fresh 

 air from the top, which will minimize the draft on 

 the pigs. Light may be secured by open space or by 

 glass, depending on the climate. Since glass is expensive, 

 it should be on the south side of the. building, so that 

 morning, noon, and afternoon rays all reach some part 

 of the pig house where sunshine is needed. Any equip- 

 ment used constantly is less expensive from the standpoint 

 of results obtained than the same equipment used only 

 a part of the time, and therefore greater expense is justified 

 in case the glass is in the south where it is used constantly. 

 A plan with this end in view has been worked out by 



