EXPERIMENT STATION BULLETINS. 161 



Average per cent butter fat, "Roots," 3.89, 



Average per cent butter fat, "No Roots," 3.90. 



The per cent of butter fat was practically the same. 



The last table gives the average weekly milk and butter fat production, 

 the average weekly cost of the rations, and the average cost of milk and 

 butter fat as taken from the three feeding trials with a total number of 

 forty cows. The table shows that, while on the root ration the cows pro- 

 duced 9.1 lbs of milk per week, or 1.3 lbs. per day more than when re- 

 ceiving no roots, that the butter fat production was increased by .344 

 lbs. per week, or ,049 lbs. per day. The addition of roots, however, in- 

 creased the cost of the ration by 12.4 cents per week, or 1.77 cents per 

 day, and the cost of milk production on the root ration was raised 4.2 

 cents per 100 lbs., of butter fat 1.1 cents per pound. 



SUMMARY. 



Increase in weekly milk flow per cow on root ration : 



Experiment 1 5 . 85 lbs. 



Experiment 2 10 . 75 lbs. 



Experiment 3 10 . 90 lbs. 



Average 9 . 16 lbs. 



Increase in weekly butter fat production, per cow, on root ration. 



Experime!3t 1 287 lbs. 



Experiment 2 413 lbs. 



Experiment 3 332 lbs. 



Average 344 lbs. 



Increase in cost of ration per cow for one week, roots added : 



Experiment 1 11 ,2 cents 



Experiment 2 12,4 cents 



Experiment 3 13,6 cents 



Average 12.4 cents 



Increase in cost of milk per 100 lbs, when on root ration : 



Experiment 1 5.01 cents 



Experiment 2 / 3 . 10 cents 



Experiment 3 4 . 50 cents 



Average 4 .20 cents 



Increase in cost of butter fat per pound, on root ration : 



Experiment 1 1 . 08 cents 



Experiment 2 '. 0.91 cents 



Experiment 3 1.50 cents 



Average 1 . 16 cents 



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