PROTEIN REQUIREMENTS. AG: 
TABLE XLI.—Giving a Summary in Pounds of Digestible Nutrients Consumed 
and Products Yielded by the Three Groups. 





Crude Carbo- Ether : Per putter Total 
GROUP Protein | hydrates Extract | ile | cone Fat Solids 
| | s 
it 2.039 atl 7/() 53 27.77 | 4.54 | 1.260 3.737 
II. | 1.684 ii Ot 30.60 | 3.80 | 1.164 3.719 
Ill. | 1.322 16 50 26.84 | 4.40 | 1.182 3.524 






The amount of nutrients consumed daily other than 
crude protein by the different groups was remarkably simi- 
lar, groups I and II each receiving 12.32 pounds while group 
III received 12.26 pounds, being only .06 of a pound less per 
day. Of protein, group I received 2.039 pounds daily and 
yielded 27.77 pounds of milk testing 4.54percent fat. Group 
II received 1.684 of protein and gave 30.60 pounds of milk 
testing 3.8 per cent butter fat and group III taking ration 4, 
received 1.322 pounds of protein daily and returned 26.84 
pounds of milk testing 4.4 per cent butter fat. Thesufficiency 
of the rations containing different amounts of protein can- 
not be measured by the quantity of milk yielded because the 
milks from the three groups differed in quality. The yield 
of butter fat is a better guide as to tke productive virtue of 
the rations. Group I, that received 2,039 of protein daily, 
yielded 1.260 lbs. butter fat, while group JI, with 1.684 of 
protein, gave 1.164 of butter fat and group III with 1.322 
of protein gave 1.182 of butter fat, showing that the differ- 
ence in the yield was not caused by the difference in protein 
supply alone, because croup III returned more butter fat 
than group II. Comparing the yield of milk and butter fat 
by the different groups with the nutrients consumed by each, 
it appears that a ration containing 1.322 of protein is prac- 
tically as potent in milk production as are the rations that 
contain 1.684 and 2.039 pounds of protein respectively; that 
the product yielded bears a closer relation in quantity to 
total nutrients consumed than to the protein supply or 
nutritive ratio of the rations. . 
In seeking for further light as to the sufficiency of the 
protein in the different rations, by examining into the pro- 
ducts returned to available nutrients consumed, the follow- 
ing tables, taking into account the food of maintenance, are 
submitted: 
