
PROTEIN REQUIRED FOR DAIRY COWS. 163 
TABLE 77. 
COMPARISON OF AVERAGES OF 21 ORIGINAL AND 21 RECOM- 
MENDED RATIONS. 
Average Pounds of Grain and Roughage Fed per Cow per Day, 
with Protein Content and Fuel Value, also Average 
Daily Milk Flow and Yield of Butter. 








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D. 21, - |277| 1.85| 28,240) 8.49) 14.77] 9.4)17.25| .954)19.43) 4.4)15.03 
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1. The Wolff standard for a 1,000-pound dairy cow giving 
an average quantity of milk called for 15.4 pounds of total 
nutrients, of which 2.5 pounds should be protein, 12.5 pounds 
carbohydrates, and 0.4 pound fat. This amount of total nutri- 
ents is equivalent to 29,588 calories. Kuhn gives the require- 
ments for maintenance for a cow weighing 1,000 pounds as 0.7 
pound of protein and 6.6 pounds of nitrogen free extract, 
which is equivalent to 13,578 calories. ; 
he cows in these tests weighed 760 pounds, and there would 
be required for maintenance 5.55 pounds of nutrients, equiva- 
lent to 10,320 calories. The amount of total nutrients required, 
therefore, for a cow weighing 760 pounds and giving an average 
quantity of milk may be assumed to be (15.4—1.75) 13.65 
pounds, equivalent to 26,330 calories. 
The calories in the original ration averaged 28,240 against 
27,170 in the recommended one. The latter amount is still 
above the theoretical needs of the cow. The depression of the 
recominended rations as compared with the original rations 
to the extent of 1,070 calories, and this in the form of roughage, 
may have been an advantage to the cows consuming them, 
rather than a disadvantage. 
This point is borne out by a comparison of the original and 
recommended rations in this particular. In Table 78 the original 
‘and recommended rations are grouped as follows: In the upper 
