
NITROGENOUS FEEDING STUFES. 99 
¢¢ 
I. The kind of food had a decided and material effect upon the quantity 
of milk produced as regards percentage of fat and solids. The rations com- 
pared produced an average difference of over one-half a pound of fat and nearly 
three-quarters of a pound of solids per 100 pounds of milk. 
“2. Change of feed influenced the quality of the milk considerably more 
than it did the quantity. Where one ration produced twenty-seven per cent. 
more butter-fat (gross yield) than the other, the increase in milk flow was only 
eight per cent. Two-thirds of the increase in gross yield of butter-fat was due 
to improved quality of milk, and only one-third to increased guantity. 
“3. The ratio of fat to ‘ solids not fat,’ was considerably modified by change 
of feed. Under one feed (wide ration) the ratio averaged 396:1000, and under 
the other (narrow ration) 457:1000.”’ 
Four cows varying in live weight between 875 and 1150 
pounds were used. All of the cows had calved within six 
weeks previous to the beginning of the experiment. ‘The 
daily rations per cow during periods 1 and 2 were as follows: 
PERIOD I. PHRIOD 2. 
Corn and Cob Meal Ration. Sugar Meal (Gluten Feed) Ration. 
124% pounds corn and cob meal. 10 pounds sugar meal. 
I2 pounds corn fodder. 12 pounds corn fodder. 
2 pounds clover hay. 4 pounds clover hay. 
‘“For period 3 the corn and cob meal was increased to 13 pounds, to give that 
feed a greater advantage; otherwise the amounts remained the same as in periods 
Teanc 2, 
The feeding periods covered twenty-one days each. ‘The 
rations were fed for a week before the beginning of period 1, 
and an interval of ten days was allowed between the periods for 
changing the feed, and to allow the cows to become accustomed 
to the new feed before the regular feeding period was begun. 
The cows were fed in pairs. Lot A, two cows, had the corn 
and cob meal ration (wide), during period 1; the sugar meal 
ration (narrow), during period 2; and the corn and cob meal 
again in period 3. Lot B, two other cows, had the same feeds 
in the reverse order, sugar meal (narrow) ration first, then 
corn and cob meal (wide), and for the third period sugar meal. 
‘The results with the narrow and wide rations for the two lots 
of cows of two each have been summarized in table 13. ‘The 
rations have been calculated by the writer from the actual 
amounts of food eaten during the period of twenty-one days. 
In these calculations the composition of corn and cob meal, 
and of the sugar meal, was taken as given in the report of the 
experiment. ‘The composition of other feeds used was assumed 
