214 
Journal of Agricultural Research 
Vol. XXXI, No. 3 
The growth curves of two groups of rats that were fed rations 
containing 20 and 40 per cent, respectively, of dried pork loin No. 
920 as the source of vitamin A are shown in Figure 13. Rats Nos. 
266 A to 266 D, inclusive, that were fed the ration containing 20 per 
cent of dried pork, made poor growth and all developed ophthalmia, 
while rats Nos. 267 A to 267 D, inclusive, that received the ration 
containing 40 per cent of dried pork, made slightly better growth, 
reaching weights between 100 and 106 grams. All the rats in the 
two groups developed ophthalmia by the thirty-fifth day of the test. 
Fig. 14.—Vitamin A in pork. Graphs showing rate of growth of rats that were fed a ration containing 40 
per cent of dried lean meat from pork loins as the source of vitamin A in an otherwise adequate diet. 
The ration was made up in parts by weight as follows: Dried pork loin No. 938,40; ash mixture, 4; cassava 
starch, 56; total 100 
Fig. 15.—Vitamin A in pork. Graphs showing rate of growth of rats that were fed a ration containing 40 
per cent of dried lean meat from pork loins as the source of vitamin A in an otherwise adequate diet. 
The ration was made up in parts by weight as follows: Dried pork loin No. 907,40; ash mixture, 4; cassava 
starch, 56; total, 100 
Fig. 16—Vitamin A in pork. Graphs showing rate of growth of rats that were fed a ration containing 50 
per cent of dried pork tenderloin as the source of vitamin A in an otherwise adequate diet. The ration 
was made up in parts by weight as follows: Dried pork tenderloin No. 1024, 50; ash mixture, 4; cassava 
starch, 46; total, 100 
In Figure 14 are shown the growth curves of rats that were fed a 
ration containing 40 per cent of dried pork loin No. 938 as the source 
of vitamin A. The rats made poor growth and all soon declined in 
weight and developed ophthalmia. 
In Figure 15 are shown the growth curves of rats that were fed a 
ration containing 40 per cent of dried pork loin No. 907 as the source 
of vitamin A. These rats made only slightly better growth than 
those shown in Figure 14 and all soon declined in weight and devel¬ 
oped ophthalmia. 
