PREPARATION OF FEED 215 



grains as they require it. (Fig. 47.) The grinder was com- 

 pared with a self-feed hopper. In the first test whole corn was 

 used in the hopper, and in the second ground corn. The pigs 

 were from four to five months old when the experiment hegan. 



In the first test hopper-fed pigs made an average daily gain 

 per pig of 1.85 pounds, and grinder-fed pigs 1.65 pounds. 



The feed consumed per 100 pounds gain was as follows: 



Hopper pigs. Corn, 256 pounds; middlings, 68 pounds; milk, 339 pounds. 

 Grinder pigs. Corn, 224 pounds; middlings, 76 pounds; milk, 385 pounds. 



Fia. 47. Hog motor grinder and feeder. With this machine hogs grind their own feed. 



In the second test hopper-fed pigs averaged a daily gain 



per pig of 2.11 pounds, and the grinder-fed pigs, 1.86 pounds. 



The feed consumed per 100 pounds gain in second test was : 



Hopper pigs. Corn, 287 pounds; middlings, 71 pounds. 

 Grinder pigs. Corn, 273 pounds; middlings, 80 pounds. 



The author of the bulletin states : " The motor grinder and 

 feeder gave good results in two tests. However, when used in 

 comparison with hopper feeding of both shelled corn and corn 

 meal, the margin of profit was in favor of the hopper-fed pigs." 



Hopper Feeding vs. Trough Feeding. Bulletin 150 also 

 reports two tests in which the self-feed hopper (Fig. 48) was 

 compared with trough feeding. In the first test were 10 five- 

 months-old pigs, and in the second, 10 three and one-half months. 



