210 
Journal of Agricultural Research 
Vol. XXXI, No. 3 
Thus far it appears that none of the samples of dried beef tested, 
even when used to the extent of 30 per cent of the ration, furnished 
sufficient vitamin A for normal growth in young rats. In Figure 8, 
however, are shown the growth curves of a group of rats that received 
50 per cent of dried beef Nos. 1018,1021, and 1024 as the sole source 
of vitamin A and which made practically normal growth. Rat No. 
Fig. 8 .—Vitamin A in beef. Graphs showing rate of growth of rats that were fed a ration containing 50 
per cent of dried round steak as the source of vitamin A in an otherwise adequate diet. The ration was 
made up in parts by weight as follows: Dried beef Nos. 1018,1021, and 1064, 50; dried baker’s yeast, 10; 
ash mixture, 4; hardened cottonseed oil, 2; cassava starch, 34; total, 100 
Fig. 9 .—Vitamin A in beef. Graphs showing rate of growth of rats that were fed a ration containing 95 
per cent of dried round steak as the source of vitamins A and B and of protein. The ration was made 
up in parts by weight as follows: Dried beef, 95; calcium carbonate, 4.5; sodium chloride, 0.5; total, 100 
412 A, a male, made fully normal growth and was in fair condition 
at the end of the test. The other male rats, Nos. 412 B and 412 D, 
did not make quite so rapid growth and were in fair condition at the 
close of the experiment. The female rat. No. 412 C, did not make 
quite normal growth and was in fair condition at the end. 
