The oderless hog pen is made by digging a pit of one meter in depth and filling it with waste rice hulls or sawdust mixed with soil. The pigs are raised on this bed. Their waste sinks into the bed eliminated odor as it is decomposed by micro-organisms. The bed also eliminates an anaerobic condition which is the primary cause for a strong odor to develop. The hogs in this kind of pen are also much more content then in a pen with a concrete floor. After a few months the compost bed which by that time is valuable fertilizer is removed and replaced with a new bed.