New York AGRICULTURAL EXPERIMENT STATION. 35 
THE EXPERIMENT PROPER. 
CONDITIONS. 
In another experiment four similar lots of ducklings were fed 
rations which differed according to the amount of animal food. 
The proportion of the total protein of the ration derived from 
this source was approximately 20 per ct. for Lot I, 40 per ct. 
for Lot II, 60 per ct. for Lot III and 80 per ct. for Lot IV. 
So far as earlier experience went this group seemed to overlap 
the limits of most efficient! feeding. Whenever less animal food 
is used growth is usually too slow. When larger amounts are 
used the cost is excessive. The ducklings were hatched together 
and were from the same stock; all conditions except food being 
practically identical for the several lots, each of which included 
28 birds. 
FOODS. 
The grain mixtures used were,—one, ‘‘ Z”’ composed of 7 parts 
corn meal, 6 parts animal meal, 4 parts wheat middlings and 
3 parts wheat bran;—and another “G,’ composed of 2 parts 
Chicago gluten meal and one part each of germ gluten meal 
and O. P. linseed meal. Salt was added to the extent of five 
ounces in every hundred pounds of each mixture. The other 
foods were animal meal, corn meal, wheat middlings, green alfalfa 
and bone ash. The bone ash was used to prevent any possible 
deficiency of total mineral matter in any ration; and to avoid 
any great differences in amount of ash, for the animal meal 
contained so much bone that rations in which it was freely used 
had a high percentage of ash constituents. The bone ash, which 
would be unnecessary for ordinary feeding, added considerably to 
the cost of the ration. 
In the accompanying table is shown the composition of each 
food: 
Tasie I1J].—Composition or Foops Usep IN EXPERIMENT. 
F N.-free pier 
Food. Moisture. | Protein. Ash. Fiber. extract extract 
, A (fats). 
Per ct. Per ct. Per ct. Per ct. Per ct. Per ct. 
1 .bb-qqb bys oey ad eae a . 13.0 20.3 13.8 Sot 44, 5.4 
Mactiire: cGy suc vee TSE 33.8 2.6 5.3 | 41.2 6.0 
Animal meal..;...... 8.6 39.7 40.0 13 1.4 9.0 
Corn meal.... Geetercd sieve 16.6 9.1 1.3 2.0 | 66.9 | 4.1 
Wheat middlings..... 15.8 14.5 2.3 3.3 60.0 | 3.5 
Green alfalfa......... | 80.2 4.5 1.9 4.7 tate 1.0 
