CEREAL INVESTIGATIONS. 
A.ug. i, 1925 Vitamin A in Beef , Pork , and Lamb 213 
In Figure 12 are shown the growth curves of two groups of rats 
that were fed rations containing 15 and 30 per cent, respectively, of 
dried pork loin No. 903 as the sole source of vitamin A. Rats Nos. 
242 A to 242 D, inclusive, that were fed the ration containing 15 per 
Fig. 12— Vitamin A in pork. Graphs showing rate of growth of two groups of rats that were fed rations 
containing 15 and 30 per cent, respectively, of dried lean meat from pork loins as the source of vitamin A 
in otherwise adequate diets 
The ration fed to rats Nos. 242 A to 242 D, inclusive, was made up in parts by weight as follows: Dried 
pork loin No. 903, 15; purified ox muscle, 13.2; dried brewer’s yeast, 5; ash mixture, 4; cassava starch, 
62.8; total, 100 • 
The ration fed to rats Nos. 243 A to 243 D, inclusive, was made up as follows: Dried pork loin No. 903, 
30; purified ox muscle, 6.4; dried brewer’s yeast, 5; ash mixture, 4; cassava starch, 54.6; total, 100 
Fig. 13.—Vitamin A in pork. Graphs showing rate of growth of two groups of rats that were fed rations 
containing 20 and 40 per cent, respectively, of the dried lean meat from pork loins as the source of vitamin 
A in otherwise adequate diets 
The rations fed to rats Nos. 266 A to 266 D, inclusive, was made up in parts by weight as follows: Dried 
pork loin No. 920, 20; purified ox muscle, 5.4; dried baker’s yeast, 10; ash mixture, 4; hardened cottonseed 
oil, 6.8; cassava starch, 53.8 total, 100 
The ration fed to rats Nos. 267 A to 267 D, inclusive, was made up as follows: Dried pork loin No. 920, 
40; ash mixture, 4; hardened cottonseed oil, 3.6; cassava starch, 52.4; total, 100 
cent of dried pork, did not make much growth and all developed 
ophthalmia. Three of the rats that were fed the ration containing 
30 per cent of dried pork made fair growth, reaching weights between 
106 and 124 grams, while the fourth made only slight growth, but 
all the rats in this group developed ophthalmia. 
