260 



ILLINOIS STATE DAIRYMEN'S ASSOCIATION. 



The table shows that with one exception all cows produced 

 more butterfat during period II when the narrow ration was fed, 

 than in either the preceding or following periods during which 

 the medium ration was fed. The exception is cow No. 5, which 

 yielded slightly less butterfat in period II than in period I, but 

 considerably more than in period III. 



The rise in the per cent of butterfat is very marked in chang- 

 ing from the medium to the narrow ration, but far less so in 

 changing from the narrow to the medium ration, indicating that 

 the narrow ration tends to raise the per cent of butterfat in milk. 



The yield of milk gradually dropped from the beginning to 

 the close of the test except in the case of cow No. 3, which gave 

 slightly more milk in Period II than Period I. Three cows gained 

 in weight during the trial, while two lost slightly in weight, the 

 loss or gain being uniform from the beginning to the close of 

 the test. 



The results of the experiment are brought out more forcibly 

 in the following table : 



TABLE IV.— Showing Total Yields of Milk, Butterfat, and Live Weight. 



PERIOD 



Milk- 

 Pounds 



Butter-fat 



-Per 



Cent 



Butter-fat 

 —Lbs. 



Total 

 Live 

 Weight 

 —lbs. 



I. Medium ration 



II. Narrow ration 



III. Medium ration 



3274.3 

 3076.5 

 2672.0 



4.82 

 5.28 

 5.40 



155.47 

 159.82 

 141.58 



4252 

 4290 

 4351 



Average of Periods I and III 



2973.1 



5.11 



148.52 



4301 



Comparing the Average results secured in periods I and III 

 with those of period II it will be found that the narrow ration 

 produced 7.6 per cent more butterfat, increased the butterfat 0.17 

 per cent and the amount of milk 93.4 pounds, the live weight re- 

 maining practically the same. 



