New YorK AGRICULTURAL EXPERIMENT SYraATION. 63 
shrinkage of milk flow generally occurred when the percentage 
reduction of total nutrients was greatest, although this usually 
was associated with a reduction of protein. 
On the average for all records when an increase of the total 
nutrients was made, there was no change in milk production. 
On the average for all when the amount of nutrients was 
reduced, the shrinkage in milk flow was at twice the normal 
rate. | 
An increase in the amount of total nutrients to not more than 
15.5 lbs. per day for each 1000 lbs. live weight, with cows giving 
about 20 lbs. of milk, resulted in a maintenance of the milk 
yield without diminution. When the nutrients were reduced 
in corresponding rations, more than the usual shrinkage 
followed. 
An increase of the total nutrients from less than 15.5 Ibs. to 
more than that amount, for cows giving about 23 lbs. of milk, 
resulted in a maintenance of milk yield without diminution. A 
reduction of the nutrients from above 15.5 lbs. to less than that 
amount was followed by twice the normal shrinkage in milk 
yield. | 
An increase of the total nutrients when above 15.5 lbs. for 
cows giving about 24 lbs. of milk, was followed by less than 
the usual shrinkage in milk flow. A reduction of the total 
nutrients to not less than 15.5 lbs. was followed by more than 
the usual shrinkage. 
FUEL VALUE. 
An average of all records when an increase in the fuel value 
of the ration was made shows a diminution in milk yield about 
one-fifth as great as would usually occur under unchanged 
rations. An average of all records when the fuel value was re- 
duced shows about twice the usual diminution in milk yield. 
An increase in the fuel value to not more than 30,000 Cal. per 
day per 1000 lbs. live weight, for cows giving about 20 lbs. of 
milk, was followed by a slight average increase in milk flow. A 
reduction of the fuel value when below 380,000 Cal. was followed 
by considerably more than the normal shrinkage in milk. 
