PROTEIN REQUIREMENTS. 121 
TABLE XLV.—Giving:the Averages of the Groups in Weight, Total Nutrients Dailv, 
Nutrients for Maintenance, Nutrients Available for Product, 
and Nutrients to Products Yielded. 






Total For Net Nutrients to 
Group Wt. Nutrients | Mainten- For 
Daily ne Product 
5 100 Ibs. |11b Butter| 1 1b Total 
Milk Fat | Solids 
i 890 14.36 6.94 7.42 26ers, 5.89 | 1.98 
IL 909 14.00 7.09 6.91 22.59 5.94 1.86 
Iil 846 LS SOs 6.60 6.97 26.00 5.90 1.98 





By eliminating the nutrients calculated for food of main- 
tenance at the rate of Pro. .07, C. H. .7, and ether extract 
.O1 per cwt., it is found that the cows in Group I, that re- 
ceived 2.039 pounds of protein daily, returned a hundred 
pounds of milk testing 4.54 per cent butter fat to 26.72 
pounds of net nutrients; that the cows in Group II, that re- 
ceived 1.684 pounds of protein daily, returned a hundred 
pounds of milk, testing 3.8 per cent butter fat to 22.59 
pounds of net nutrients, and that the cows in Group III, 
that received 1.322 pounds of protein daily, returned a hun- 
dred pounds of milk testing 4.4 per cent butter fat to 26.00 
pounds of net nutrients. That is, ration III having 1.32 of 
protein and with a nutritive ratio of 1:9.7 appeared as po- 
tent for milk production as was ration I having 2 pounds of 
protein and anutritive ratio of 1:6.3,and that the nutrients 
required in milk production were proportionate with the 
quality of the milk yielded. 
Also, comparing the nutrients available for product with 
the butter fat yielded, it appears that the nutrients required 
to a pound of fat were very nearly thesame witheach group, 
regardless of the protein supply, since the milk testing 4 54 
per cent required 5.89 pounds of nutrients to a pound of fat, 
that testing 4.4. per cent required 5.90 pounds of nutrients 
to a pound of fat, and that testing 3.8 required 5.94 pounds 
of nutrients. 
Again, comparing the available nutrients in the rations 
with the total milk solids returned, it appears that the group 
of cows yielding milk testing 3.8 per cent fat returned one 
pound of milk solids to 1.86 pounds of nutrients, that the 
group of cows vielding milk testing 4.40 and 4.54 per cent 
fat respectively returned a pound of milk solids to 1.98 
