216 
Journal of Agricultural Research 
Vol. XXXI, No. 3 
^ a ^ EL ^ a ’ ^is sample of dried lamb is richer in vitamin A than any 
oi the samples of dried beef or pork which have been reported in this 
paper. 
In Figure 19 are shown the growth curves of two groups of rats that 
were fed rations containing 15 and 30 per cent, respectively, of dried 
lamb No. 876 as the source of vitamin A. Neither group of rats 
made much growth, all finally declined in weight, and six of the eight 
rats developed ophthalmia. 
Fig. 18 —Vitamin A in lamb. Graphs showing rate of growth of rats that were fed a ration containing 30 
per cent of dried lamb as the source of vitamin A in an otherwise adequate diet. The ration was made 
up m parts by weight as follows: Dried lamb No. 870, 30; dried baker’s yeast, 10; ash mixture, 4* hard¬ 
ened cottonseed oil, 3.5; cassava starch, 52.5; total, 100 ' ' 
Fig. 19—Vitamin A m 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 or vitamin A in an otherwise 
adequate diet ” " 
The ration fed to rats Nos. 225 A to 225 D, inclusive, was made up in parts by weight as follows* 
Dried lamb No. 876,15; purified ox muscle, 10.5; dried baker’s yeast, 10; ash mixture, 4; hardened cotton¬ 
seed oil, 6.1; cassava starch, 54.4; total, 100 
The ration fed to rats Nos. 226 A to 226 D, inclusive, was made up as follows: Dried lamb No. 876 30* 
dried baker’s yeast, 10; ash mixture, 4; hardened cottonseed oil, 2.1; cassava starch, 53.9; total, 100 
The growth curves of two groups of rats that were fed rations con¬ 
taining 20 and 30 per cent, respectively, of dried lamb No. 897 are 
shown in Figure 20. Both groups of rats made poor growth, only 
little if any better than that made by rats fed a basal ration free 
from vitamin A. Every rat developed opthalmia in 22 days or less. 
In Figure 21 are shown the growth curves of two groups of rats 
that were fed rations containing 15 and 30 per cent, respectively, of 
dried lamb No. 933 as the source of vita m in A. With the exception 
