218 
Journal of Agricultural Research 
Vol. XXXI, No. 3 
In Figure 23 are shown the growth curves of rats that were fed a 
ration containing 20 per cent of dried lamb No. 994 as the source of 
vitamin*A. The two male rats in the group made remarkably good 
Fig. 22—Vitamin A in lamb. Graphs showing rate of growth of rats that were fed a ration containing 20 
per cent of dried lamb as the source of vitamin A in an otherwise adequate diet. The ration was made 
up in parts by weight as follows: Dried lamb No. 992,20; purified casein. 10.6; dried baker's yeast, 10; ash 
mixture, 4; hardened cottonseed oil, 3; cassava starch, 52.4; total, 100 
growth, while the two females did nearly as well, sex considered. 
With one exception, the rats were still gaining in weight when the 
test was discontinued at the end of 90 days, ana all were in excellent 
condition at that time. 
