40 BULLETIN 1138, U. S. DEPARTMENT OF AGRICULTURE. 
TESTS WITH CALF THYMUS AND HOG CHITTERLINGS. 
The thymus gland of the calf is the true sweetbread. Chitterlings 
are that part of the intestinal tract of the hog used as food; and 
the product used in these tests was cooked chitterlings. In Tabie 25 
are reported the results of the feeding tests with the above-named 
tissues. The ration contaming 15 per cent of calf thymus had a 
low antineuritic value, the average survival period being only 23 
days, and the ration which contained 25 per cent of the tissue had 
ony a fair value, the average survival period of the birds being 34 
ays. 
The chitterlings tested had a fair antineuritic value. All the 
pigeons which were fed the ration containing 15 per cent of the 
chitterlings developed polyneuritis by the thirty-ninth day, and the 
three birds that received 25 per cent of the tissue in their feed all 
developed polyneuritis by the fifty-second day. The fourth bird 
in this pen died a few days after the start of the test from an unknown 
cause. It appears that the calf thymus and hog chitterlings tested 
had practically the same antineuritic value. 
The changes in the weights of the pigeons during the test are 
shown in Ficures 41 and 42. 
TaBLE 25.—Experimental feeding of dried calf thymus and hog chitterlings with polished _ 
Tce. 
: ; ae | Pigeon | Survival | Change 
Thymus and chitterlings rations. NGH period. in weight. Result. 
PEN 79. | 
Days. | Per cent. 
LSypeR.centacalit yams ss ee oe eee 92 15 —7.3 | Polyneuritis. 
1D XO Yd Ai eede res Nees bonito mia ook A a a 93 35 —24.4 | Died. 
1D YO oe ees Stearn Sc Roe aay SBS | 94 26 —19.6 | Polyneuritis. 
IDO as Se a eee es mie nts eee Sa SSAeee EC | 95 | 14 —14.3 Do. 
we nie a waoh  s | al BS A et Sy 
PANVICTA CESS ee as ser ROA sa oy a Bes ee ak en 23 —16.4 
PEN 80. 
Zo percent calhthymusssase epee eee ene 88 25 | 14.2 | Removed account badly in- 
fected eyes. 
EX RRO S SE SH eA OOS Soon Ma oes oobeeaSe 89 55 —24.5 | Fair condition end of test. 
DOT eee ce Sac ee ee eer eS | 90 35 +.7 | Polyneuritis. 
TD) ORES SSE cis CRE IS eee | 91 22 +6.6 Do. 
MASV CTS Oceans eo Sop | ee eae 34 | —7.9 
PEN 81. 
15 spercent chitterlin gseees seen eee 9 19 —10.3 | Polyneuritis. 
TD) OU Bae Sea i ON ay ee eet Sa lg 10 15 —6.7 Do. 
DD) Oe Ro eee Rene 11 39 —34.3 Do. 
DOR Se Sepretiee ean ied Seis cena eee ee os | 70 195)" 15.4 Do. 
AVG ES Obi cerers nem are tec ugcen ore everest 23 —16.7 
PEN 82 
25 pericent chitterlings =. ¢e 0a eeh eee 13 17 | —.6 | Polyneuritis. 
iD OS ase anaes aae SE cia ee aroneoe 15 46| —22.4 Do. 
IB) Os Saree cee Ne Rice eierateeete ete 16 52| —14.8 Do. 
ENN 2) eX eee Per ai eee Se a ee ere len ee LO 38 —12.6 
