New YorK AGRICULTURAL EXPERIMENT STATION. i ELE 
fungus and insect pests and offers specially good opportunities 
for experimental work. 
DEPARTMENT OF ANIMAL HUSBANDRY. 
The adaptability of concentrated by-products for feeding.— 
The question as to the source of additional protein for the ration 
continues to be an important one. This is particularly true in 
poultry feeding when large flocks are kept in confinement. 
Karlier experiments have shown that at times, especially during 
periods of rapid growth by the young, there is needed in the 
ration-a much larger proportion of protein and of mineral 
matter than is supplied by the foods that must chiefly be used, 
as the common grains. To prevent a lack of these essential con- 
‘stituents various concentrated by-products are fed. The adapt- 
ability of many of these materials cannot be satisfactorily de- 
termined except by observing the effects of their use under vari- 
ous conditions. As contributing toward this knowledge Bulletin 
No. 271 reports the results from a few feeding trials in which 
certain by-products were freely used. 
Of three highly nitrogenous rations fed to ducklings, one 
containing dried blood and bone meal was associated with much 
slower rate of growth than one containing animal meal and 
another, containing “ milk albumen” and bone meal; though the 
same amount of food under each ration gave equal increase in 
weight. The superiority of the two rations seemed due chiefly to 
their greater palatability. 
Of four rations carrying much concentrated food one contain- 
ing a large proportion of gluten meals proved inferior, when fed 
to young chicks, to another having in addition bone meal, and 
much inferior to others in which most of the gluten meals was re- 
placed by animal meal or a by-product called “ milk albumen.” 
Unpalatability seemed largely responsible for the inferiority of 
the two rations. The poorest was also deficient in mineral 
matter. 
The rations containing “ milk albumen” were more palatable 
and seemed more healthful than the others, but owing to the 
higher price for this food it was not profitably used in the de- 
sired quantity.. The rations containing animal meal were more 
profitably fed. 
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