Aug. 1, 1925 
Vitamin A in Beef ’ Pork , uraZ Lamb 
215 
In Figure 16 are shown the growth curves of rats that were fed a 
ration containing 50 per cent of dried pork tenderloin No. 1024 as 
the sole source of vitamin A. Three of the rats made poor growth, 
while the fourth did somewhat better, but all finally declined in 
weight, and three of the rats developed ophthalmia. 
In Figure 17 are shown the growth curves of rats that were fed a 
ration consisting of 95 per cent dried pork loins, 4.5 per cent calcium 
carbonate, and 0.5 per cent sodium chloride. Three lots of pork loins 
Nos. 873, 884, and 903, that had been used in experiments already 
reported, were fed during the course of the experiment. While this 
group of rats made much better growth than any of the other groups 
that were fed rations containing dried pork as a source of vitamin A, 
they did not make nearly normal growth and all developed oph- 
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Fig. 17—VitaminIB in pork. Graphs showing rate of growth of rats that were fed a ration containing 95 
per cent of dried lean meat from pork loins as the source of vitamins A and B and of protein. The ration 
was made up in parts by weight as follows: Dried pork loins, samples Nos. 873, 884, and 903, 95; calcium 
carbonate, 4.5; sodium chloride, 0.5; total, 100 
VITAMIN A IN LAMB 
Description of Samples 
Six samples of lamb were tested for vitamin A. Each of five sam¬ 
ples was prepared from the hind saddle of the carcass of high-grade, 
heavy, fat lamb, while the other sample was prepared from two hind 
saddles of fighter weight fat carcasses. The hind saddles of the 
heavy lambs weighed from 18 to 20 pounds each, while the fighter 
saddles weighed 12 pounds each. One lamb carcass had its origin 
in East St. Louis, Ill., one in Omaha, Nebr., one in South St. Joseph, 
Mo., and the other three lambs were slaughtered at Benning, D. C. 
The muscle tissue was separated from fat and connective tissue and 
dried in the manner previously described for beef. Each sample of 
dried lamb was analyzed for nitrogen and fat before being incorpo¬ 
rated in a ration. 
Feeding Tests with Lamb 
In Figure 18 are shown the growth curves of rats that were fed a 
ration containing 30 per cent of dried lamb No. 870 as the sole source 
of vitamin A in an otherwise adequate diet. Each of the rats made 
very good growth for a time, but all finally ceased to gain, then lost 
weight, and developed ophthalmia. One female rat, No. 201 C, 
nearly reached normal weight and then declined and developed oph- 
