~-o- 
TO La 
Pais 
New York AGRICULTURAL EXPERIMENT STATION. 63 
ing Lot I+ for four weeks on the animal meal ration after the con- 
trasted feeding was finished. The growth made by this lot was 
then rapid and the gain in weight nearly as great as that which 
had been made by Lot A two months earlier when the average size 
was about the same as that of the older birds from Lot B during 
this later period. The disadvantage of living on the inferior 
ration was, however, never entirely overcome, and the birds failed 
to reach the size ultimately attained by the birds having from the 
start the animal meal ration. 
The average weight of 1 lb. was reached by Lot A three weeks 
sooner than by Lot B, the average weight of 2 lbs. over five weeks 
sooner and the average weight of 3 lbs. over eight weeks sooner. 
At seven weeks of age the average weight for Lot A was over 3 
Ibs. and for Lot B less than 1 lb. At nine weeks of age the 
average weight for Lot A was about 4.5 Ibs. and for Lot B about 
1.5. At eleven weeks of age the average weight for Lot A was 5 
Ibs. and for Lot B it was 2 lbs. 
IN CONCLUSION. 
The rations in which from 40 to 50 per cent of the protein was 
supplied by animal food gave in every trial more economical re- 
sults than the contrasted rations in which most of the protein came 
from vegetable sources. 
The chief advantage of the one ration over the other was in the 
much more rapid growth induced by it, although the cost for each 
pound gain in weight was also in its favor. The inefficiency of 
_the one ration was probably in part due to its inferior palatability. 
This was not very noticeable with the chicks or cockerels, but it 
was quite apparent with the ducklings, especially at the start when 
slight modifications in the ration were continually made. 
The results of this feeding experiment do not alone warrant 
final conclusions as to the necessity for animal food. But con- 
sidering with them the results of other feeding experiments not 
yet reported, which all point in the same direction, there appears 
justification for the belief that the superiority of the one ration 
was due to the presence in it of the animal food. | 
