114 Report oF THE DEPARTMENT OF ANIMAL HUSBANDRY OF THE 
weeks the growth was much slower although made at a profitable 
rate for a fortnight or more. 
RELATIVE EFFICIENCY AND ECONOMY OF THE RATIONS FOR DUCK- 
LINGS. 
There seemed to be no difference in the palatability of the ra- 
tions. The birds appeared in equally good health under both, 
and there was no loss in either lot. The ducklings in Lot C 
grew much faster and ate much more food during all periods of 
the experiment. As much or more food was eaten at all times 
by the birds in Lot D in proportion to their size. The consump- 
tion of food was 26 per ct. greater for Lot C and the gain in 
weight 65 per ct. greater. 
The dry matter in the food for each pound gain in weight was 
3.38 pounds for Lot C and 4.3 pounds for Lot D. The cost of 
food per pound gain in weight up to ten weeks of age was 8.5 
cents for Lot C and 4.1 cents for Lot D. At five weeks of age 
the average weight of the ducklings in Lot C was 2.5 pounds 
and in Lot D 1.4 pounds. At eight weeks of age the average 
weights were 4.5 pounds for Lot C and 2.9 pounds for Lot D. 
At ten weeks of age the weights were 5.75 pounds for Lot OC and 
3.7 pounds for Lot D, and at twelve weeks the average weights 
were 6.4 pounds and 4.7 pounds respectively. The average 
weight of two pounds was attained by Lot C 1.8 weeks sooner 
than by Lot D, the average weight of three pounds 2.3 weeks 
sooner, the average weight of four pounds 3.3 weeks sooner and 
the average weight of five pounds about a month sooner. The 
birds in Lot C reached the average weight of six pounds at 10.4 
weeks of age. Those in Lot D did not reach this weight while 
feeding records were kept, but birds from this lot attained later 
in the season practically the same size as those more quickly grown. 
Under the vegetable food ration with bone ash the ducklings 
were able to make a moderate and regular growth and remain 
in continual good health. This, other lots of ducklings had be- 
