Aug. 1, 1926 
Vitamin A in Beef \ PorTc y and Lamb 
217 
of one rat. No. 293 B, which made only fair growth and then declined 
in weight, the rats that were fed these rations made very poor growth. 
Six of the eight rats developed ophthalmia. 
In Figure 22 are shown the growth curves of rats that were fed a 
ration containing 20 per cent of dried lamb No. 992 as the source 
of vitamin A. All the rats made excellent growth, practically 
Fig. 20.—Vitamin A in lamb. Graphs showing rate of growth'Of two groups of rats that were fed rations 
containing 20 and 30 per cent, respectively, of dried lamb as the source of vitamin A in otherwise adequate 
diets 
The ration fed to rats Nos. 236 A to 236 D, inclusive, was made up in parts by weight as follows: Dried 
lamb No. 897, 20; purified ox muscle, 7.9; dried baker’s yeast, 10; ash mixture, 4; hardened cottonseed 
oil, 4.6; cassava starch, 63.5; total, 100 
The ration fed to rats Nos. 237 A to 237 D, inclusive, was made up as follows: Dried lamb No. 897,30; 
purified ox muscle, 1.8; dried baker’s yeast, 10; ash mixture, 4; hardened cottonseed oil, 2; cassava starch, 
52.2; total, 100 
Fig. 21.—Vitamin A in lamb. Graphs showing rate of growth of two groups of rats that were fed rations 
containing 15 and 30 per cent, respectively, of dried lamb as the source of vitamin A in otherwise adequate 
diets. 
The ration fed to rats Nos. 293 A to 293 E, inclusive, was made up in parts by weight as follows: Dried 
lamb No. 933, 15; purified ox muscle, 9; dried baker’s yeast, 10; ash mixture, 4; hardened cottonseed 
oil, 7.7; cassava starch, 54.3; total, 100 _ . , 
The ration fed to rats Nos. 294 A to 294 D, inclusive, was made up in parts by weight as follows: Dried 
lamb No. 933,30; dried baker’s yeast, 10; ash mixture, 4; hardened cottonseed oil, 6.6; cassava starch, 
49.4; total, 100 
normal for the sexes. One male, No. 372 C, reached the maximum 
weight for the group and then rapidly declined in weight to 181 
grams when it was removed from the test. This rat was in very 
poor condition at the time but showed no signs of ophthalmia. The 
three other rats gained in weight until the close of the test and were 
in excellent condition at the end. This sample of dried lamb is 
richer in vitamin A than any of the other samples of meat thus far 
reported in this paper. 
