418 Western Live-stock Management 
numerous repeated tests it was found that 100 pounds of 
feed put in the self-feeder would actually make more pork 
than if fed by hand in the most approved manner. The 
very great practical value of the self-feeder was therefore 
Fic. 38. — Self-feeder. 
put beyond all question. Later an extension of this system 
to eliminate the labor of mixing feeds has been put into 
practice by the Iowa Experiment Station. Several self- 
feeders in which were placed various ground grains and 
tankage, each in separate compartments, were provided, 
and the pigs were allowed to balance their own ration. 
