Aug. 1,1925 
Vitamin A in Beef, Pork, and Lamb 
209 
The growth curves of two groups of rats that were fed rations 
containing 15 and 30 per cent, respectively, of dried beef No. 912 as 
the sole source of vitamin A are shown in Figure 6. The rats getting 
the ration containing 30 per cent of dried beef made slightly more 
growth than the other group, but the amount of vitamin A in this 
ration was far from adequate, and every rat in the two groups de¬ 
veloped ophthalmia. 
Fig. 6 .—Vitamin A in beef. Graphs showing rate of growth of two groups of rats that were fed rations 
containing 15 and 30 per cent, respectively, of dried round steak as the source of vitamin A in otherwise 
adequate diets 
The ration fed to rats Nos. 260 A to 260 D, inclusive, was made up in parts by weight as follows: Dried 
beef No. 912,15; purified ox muscle, 9.2; dried baker’s yeast, 10; ash mixture, 4; hardened cottonseed oil, 
7.6; cassava starch, 54.2; total, 100 
The ration fed to rats Nos. 261 A to 261 D, inclusive, was made up as follows: Dried beef No. 912, 30; 
dried baker’s yeast, 10; ash mixture, 4; hardened cottonseed oil, 5.1; cassava starch,_50.9; total, 100 
adequate diets 
The ration fed to rats Nos. 295 A to 295 D, inclusive, was made up in parts by weight as follows: Beef 
No. 934, 15; purified ox muscle, 9.4; dried baker’s yeast, 10; ash mixture, 4; hardened cottonseed oil, 7.2; 
cassava starch, 54.4; total, 100 
The ration fed to rats Nos. 296 A to 296 D, inclusive, was made up as follows: Beef No. 934, 30; dried 
baker’s yeast, 10; hardened cottonseed oil, 5.6; ash mixture, 4; cassava starch, 50.4; total, 100 
In Figure 7 are shown the growth curves of two groups of rats that 
were fed rations containing 15 and 30 per cent, respectively, of dried 
beef No. 934 as the source of vitamin A. The average rate oi growth of 
the rats getting the ration containing 30 per cent of the dried beef is 
somewhat higher than that of the other group, but the growth of all the 
rats is far below normal. Ophthalmia developed in six of the rats. 
60304—25f-2 * 
