New York Agricultural Experiment Station. 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 lbs. 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 30,000 Cal. was followed 

 bv considerablv more than the normal shrinkage in milk. 



