FACILITY OF DIGESTION A FACTOR IN FEEDING 17 
In a study of 21 herds of 277 cows (Report 1904, p. 166) it 
was shown that an increase in the concentrates of a ration was 
attended with an increase of the milk flow, and that a decrease 
in the concentrates was attended with a decrease in the milk 
flow. The increase or decrease in the milk flow resulting from 
a change in the ration followed more closely the increase or de- 
crease of concentrates than the change in the amount of pro- 
tein or calories. | 
In the above trials the effect of an increase or decrease of 
concentrates in the rations was obscured by the accompanying 
increase in protein and decrease in calories. In the following 
experiment the amount of protein and calories of the two ra- 
tions composed are the same, the only varying factor is in the 
proportion of grain to roughage. 
Six cows in the College herd were fed in periods I. and III. a 
ration containing 6 pounds of grain and in period II. a ration 
containing 1114 pounds of grain. Both rations contained the 
same amount of protein, carbohydrates and fat. 
TABLED. 
Ration fed in periods I. and ITi. 









DIGESTIBLE NUTRIENTS. 
Kinp AND AMOUNT OF FEED. 
| Protein oye Fat. 
Lbs. bs: Lbs 
45 20D oD 
BO COL a SUL Ee Cre ct ey cede. a Wales nels oo» ats) eke LOF 
LOAMIGL Teh 60 Ras eee re ae Gol ieee ee re . 456 22 ay) 
Tera Demcattan Seeq ineal.. 4.6. eo oe ee ee aos 1.92 iS 
nT SUM TAT eee ka hei be Ste we ea — eS 
| 1.636 9.96 67 


