140 
IOWA ACADEMY OF SCIENCE Voi.. XXVIII, 1921 
introduce another table, namely Table II, which figures all the 
groups to the same weight, or approximately 189 pounds. This 
gives us better material for comparison. Table II, therefore, puts 
all groups upon a similar basis in that a definite sized pig is pro- 
duced, taking them all at approximately the same size, namely 
forty-eight pounds at weaning time. In this table is given the aver- 
age final weight, number of days required to reach the weight of 
approximately 189 pounds, average daily gain, and feed required 
for a hundred pounds of gain. 
TABLE NO. II 
Lot. No. 
I 
II 
III 
IV 
V 
VI 
Average Final Weight 
188.6 
189.8 
189.5 
189.5 
188.9 
190.8 
No. Days Required to 
Reach Weight 
124 
-116 
104 
114 
119 
124 
Average Daily Gain 
1.13 
1.22 
1.35 
1.24 
1.18 
1.14 
Feed Required for a 100-lb 
Corn, Shelled 
Gain : 
356.5 
309.5 
321.1 
Hominy Feed 
370.1 
336.3 
40i2 
Corn Oil Cake Meal 
*57.6 
”E6 
53.1 
8.4 
Tankage 
’4^2 
19.2 
43.2 
*30.7 
17.8 
21.6 
Salt 
0.0 
0.10 
0.0 
0.0 
0.2 
0.0 
Total 
398.7 
386.4 
369.9 
400.8 
407.3 
433.2 
Note that in Table II the feed required for a hundred pounds 
of gain in the “shelled corn groups,” namely I to III, was de- 
creased by the addition of corn oil cake meal in both instances. 
Where the pigs were “camouflaged” a bit by mixing the corn oil 
cake meal with the tankage (group II) they took 8 days less time 
to reach the necessary weight than where just the straight corn 
and tankage was used and practically twelve pounds less feed was 
required for a hundred pounds of gain. In Group III where these 
three feeds were all fed “Free-Choice” style twenty days were 
saved and practically twenty-nine pounds of feed. 
This shows quite clearly that under the conditions of this ex- 
periment with young growing pigs corn oil cake meal when added 
to the corn and tankage ration fed on timothy pasture in conjunc- 
tion with salt apparently supplied some deficiencies because the 
pigs on account of such addition gained rapidly and required less 
feed to make the same amount of gain. 
Now why was Group II camouflaged? Remember that the pig 
is a physiologist and that he eats to suit himself and not his owner ; 
therefore, it may be necessary to make certain mixtures so that the 
growing and fattening process will be advantageous to the owner 
of the pig. It is only by the proper balancing of the physiological 
