64 THE CREAMERY PATRON'S HANDBOOK. 



AMERICAN AND GERMAN FEEDING STANDARDS FOR DAIRY 



COWS. 



DIGESTIBLE NUTRIENTS PER DAY PER 1,000 POUNDS LIVE WEIGHT. 



*Organic matter. 



Upon examining the table, it will be observed that there is a general 

 agreement in the standards submitted except that Woll's proposed stand- 

 ard contains .35 of a pound less protein, and .34 of a pound more fat or 

 ether extract than the original Wolff standard. The Atwater-Phelps pro- 

 posed standard varies the ether extract from .5 to .8 of a pound. The excess 

 of ether extract in these two proposed standards is doubtless due to the 

 fact that American feed stuffs contain a larger supply of this nutrient. 

 The standard proposed by Dr. Lehmann appears to have been merely a 

 mathematical, deduction based upon the assumption that, for example, 

 a cow weighing 1,000 pounds requires .7 of a pound of digestible protein 

 daily for maintenance of the body and .081+ of a pound of protein for each 

 pound of milk yielded; for 1.60 pounds protein prescribed for a cow giving 

 11 pounds of milk daily, less .7, the amount needed for maintaining the 

 body, leaves .9 of a pound of protein available for the production of 11 

 pounds of milk, and .9-^-ll=.081+. Again, if a cow yielding 22 pounds 

 of milk requires 2.5 pounds of digestible protein daily and she requires 

 .7 of a pound for maintenance there is left 1.8 pounds of protein available 



