EXPERIMENT STATION BULLETINS. 



271 



had a crippled hog in the piggery since these devices have been in use. 

 We dislilve the plan of boarding or planking over the entire cement 

 floor surface of a pen during the winter even for farrowing, as dung 

 and urine Avork in between and under the boards or planks, producing 

 very unsanitary conditions. 



Figures 41 and 42 also show one of the two forms of doors used in the 

 piggery. These doors swing inward from the top and are opened from 



Fig. 42. 



the central alley by a small rope operating over two pulleys as shown 

 in Fig. 40. A light steel rod shaped door spring, fastened to the casing 

 and top of door, forces it shut. Both the door casing and sill are 

 widened by a two-by-six inch boxing which prevents the pigs from 

 getting their noses under the bottom or side of the door to get out. A 

 pig can come in but cannot get out if the door is closed. The only 

 objection to this form of door is that an extremely severe southerly 

 gale pushes them open a little and lets in too much cold; this is pre- 

 vented by the use of small bolts for emergency cases. On the north 

 side of the building the doors were constructed to slide up and down, 

 but these could not be used on the south side without shutting off some 

 light, the windows being directly over the doors. In addition to a 

 door, each pen on the south side has a window above it and also a 



