30 BULLETIN 1138, U. S. DEPARTMENT OF AGRICULTURE. 
Thefrations containing 15 and 25 per cent, respectively, of hog 
kidney, each protected pigeons against polyneuritis for a period of 
63 days and all the birds were in good condition at the end of the 
test. The birds getting the ration that contained 15 per cent hog 
kidney maintained their weight, and those getting 25 per cent hog 
kidney in their feed gained an average of 8.9 per cent. On comparing 
the results of the tests with ox kidney and hog kidney it appears 
that they have practically the same antineuritic value. 
Figures 28 and 29 show the changes in the weights of the pigeons 
fed the ox- and hog-kidney rations. 
PaALstW -5e. PING, 
ABA LKE CLAN TS FAPNENE aD FEE CLS KAP EY 
SS 
<0 EH HORIZONTAL SIVICE REPRESENTS 10 27775 
Fic. 28.—Dried ox kidney; changes in weights of pigeons fed. 
FAM ES PPLIVN SF 
48 FER CLINT KIDNEY 2D ft - CGEINIES IONE ae =e 
FFO a | Ty = j | | i | j } j | Be 
#20 pet 
400 : 
67 | | et 
A SR A ee 
200 PNP NT eV LL E 
360 = 
: le Bb ae < é/ | tees ber eel es by | 
SAUBENee £EceSeeee Per sane ee 
300 v BERROeScee 
ee LAICH HORIZON THil2 SFVICGE SELEIAEES CNIS SD OFT 
Fig. 29.—Dried hog kidney; changes in weights of pigeons fed. 
TESTS WITH OX SPLEEN AND HOG SPLEEN. 
In Table 19 are presented the results of the feeding tests with 
ox spleen and hog spleen. Fifteen per cent of ox spleen in a ration 
was sufficient to protect three out of four pigeons against poly- 
neuritis during a test period of 57 days, but the fourth bird devel- 
oped the disease on the fifty-second day. The average loss in weight 
of the birds was 13 per cent. Twenty-five per cent of ox spleen 
protected four pigeons for 57 days and the average loss in weight 
was 15.6 per cent. 
The feeding tests with hog spleen yielded results very similar to 
those obtained with ox spleen. Fifteen per cent of hog spleen pro- 
tected three pigeons against polyneuritis for 57 days, but one bird 
developed the disease on the forty-ninth day. Twenty-five per 
cent of hog spleen protected three pigeons for 57 days, but one bird, 
No. 67, was greatly emaciated at the close of the test. Another 
bird, No. 83, died on the forty-fourth day without having shown 
any characteristic symptoms of polyneuritis. Every pen of pigeons 
on the ox-spleen and hog-spleen diets lost considerably in weight, the 
percentages ranging from 13 to 20.4. Figures 30 and 31 show the 
changes in the weights of the pigeons fed the ox- and hog-spleen rations. 
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