14 DEPARTMENT BULLETIN 149% XJ. S. DEPT. OF AGRICULTURE 
ments, however, an additional increase in weight, averaging 136.04 
pounds, was made on the hardening ration. This was 2.48 times the 
gain previously made on peanuts. Despite this large gain on the 
hardening feed, resulting in excessive finished weight, the average 
committee grading was medium soft, with a corresponding refractive 
index of 1.4603. 
Figure 5 shows in graphic form the results from this group of 
hogs. 
The 27 hogs having a range of initial weights from 115 to 142 
pounds, inclusive, were divided into two major groups according to 
the gains made on peanuts, as follows : Group 1, 25 to 49 pounds, and 
Group 2, 50 to 74 pounds. The hogs in each group were then sub- 
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Fig. 5. — Hardening on corn with nonsoftening supplements following softening on 
peanuts. Initial weights of pigs, 115 to 142 pounds. Grade limits of refractive 
index which are shown apply only to the two curves which represent hardening. 
Those for softening on peanuts and for progressive hardening on corn with non- 
softening supplements are shown in Table 1 
grouped in 25-pound intervals, according to gains made on the 
hardening ration. Averages of the data by subgroups were deter- 
mined for charting purposes. The curves for the progressive harden- 
ing on corn with nonsoftening supplements and for the softening on 
peanuts are the same as shown in Department Bulletin 1407 (4, fig- 
10). Points on the latter curve representing 38 pounds' gain and 62 
pounds' gain on peanuts (the averages for the two major groups) 
were taken as starting points for the two curves representing harden- 
ing on corn after softening on peanuts. 
The influence of the difference in gain on peanuts is strikingly 
shown. At their closest approach the two curves which represent 
hardening are apart nearly 3.5 points in refractive index. The very 
slow hardening which occurred in both groups is, likewise, very 
