24 DEPARTMENT BULLETIN" 1492, U. S. DEPT. OF AGBICULTUEE 
The curves for corn with nonsoftening supplements and soy beans 
with a medium ration of shelled corn in Figure 9 were taken from 
Figure 14, in Department Bulletin 1407 (^). The hardening which 
occurred subsequently to the softening on the soy-beans-corn ration 
is clearly shown in the chart. A continuous and fairly steady in- 
crease in firmness is indicated by the curve representing the harden- 
ing. A decline of about 10 points in refractive index, from approxi- 
mately 1.4609 to 1.4599, is shown. The latter point was reached at 
a weight of approximately 320 pounds. The hardening appears to 
have proceeded somewhat more rapidly during the early part of the 
period than during the latter part. 
Point A in Figure 9 represents a gain on corn and tankage of 
1.5 times that previously made on the soy-beans-corn ration. It falls 
well within the limits of the medium-hard grade, with a refractive 
index of about 1.4600. 
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Fig. 9. — Hardening on corn with tankage after softening on soy beans with a 
medium (from 2 to 2.5 per cent) ration of shelled corn. Initial weights of 
pigs, 115 to 176 pounds 
The results from the 43 hogs as brought out in Table 8, in Figure 9, 
and in the discussion provided the basis for another of the 1925 con- 
clusions (7) released after the conference of that year. The conclu- 
sion follows : 
Soy beans grazed with a supplementary ration of 2.5 per cent of shelled corn 
with or without minerals self-fed to pigs starting at weights of 115 pounds 
and over and making gains of approximately 40 to 90 pounds through a period 
of from six to eight weeks will produce firm carcasses in the usual case pro- 
vided a subsequent gain in weight is made on corn with tankage 1.5 times that 
previously made on the soy-bean-2.5 per cent corn ration. 
This statement, like the preceding one, is very conservative. The 
data suggest, in fact, that gain on the hardening ration equal to that 
made on the softening ration may be depended on to produce firm 
hogs. This, however, is not offered as a conclusion, but to point out 
the approximate margin of safety allowed in the statement. 
