2. NUTRIENT REQUIREMENTS. 
This report is a continuation of the one made in bulletin 
71 of June, 1901. on a further study of the nutrients actually 
required by dairy cows in milk production. In the bulletin 
referred to, the subject of protein requirements only, was 
considered, while in this, nutrient requirements are taken up. 
In bulletin 71 the subject of feeding standards was briefly 
reviewed and a table submitted from Henry’s Feeds and 
Feeding, giving the several standards, which is reproduced 
for convenience. 
TABLE XVIII.—American and German Feeding Standards for Dairy Cows, Diges- 
tible Nutrients per Day per 1000 Pounds Live Weight. 






— DIGESTIBLE NUTRIENTS Nutri- 
RATION Matter) ———————————_ |_ tive 
Pro- | Carbo- | Ether | Ratio 
tein |hydrates| Extract 
IPOS || IE, || EES Lbs. 
Wolff original (German) feeding ration.. 24.0’ 2S 12.5 4 BA: 
Woll proposed American ration.. 24.5 2.15 13.27 4s | EG.) 
Atwater and Phelps proposed standard..| 25.0’| 2.5 |12 to13 .5 to.8] 1:5.6 
Wolff-Lehmann modified standard— 
I. When giving 11 lbs. of milk daily.| 25.0 1.6 10.0 3 1:6.7 
Il. When giving 1614lbs. of milk daily.| 27.0 2.0 11.0 4 1:6.0 
Ill. When giving 22 lbs. of milk daily.| 29.0 2.5 13.0 13) ONES IA7¢ 
IV. When giving 2714lbs._ of milk daily.| 32.0 S63 13.0 8 1:4.5 
Standard maintenance ration................ 18.0 7h 8.0 cal a Us Ea Lage} 



‘Organic matter. 
In general feeding practice it has become apparent that 
feeding standards based on the weight of animals without 
reference to product yielded, were not satisfactory guides 
and that some modification was desirable. 
To meet this Dr. Lehmann suggested the modification 
given in the table, based upon certain stated yields of milk. 
It appears quite evident that he used the original Wolff fac- 
tors for daily maintenance, that is, .7 of a pound of diges- 
tible protein, 8 pounds of carbohydrates, and .1 of a pound 
