1911.] PUBLIC DOCUMENT — No. 31. 121 



(lav) will be productive of satisfactory results in case of cows 

 weighing' 900 pounds and producing daily 12 quarts of 4 per 

 cent, milk.^ 



An excess of 50 per cent, of digestible crude protein above 

 the protein minimum is believed to be ample for all ordinary 

 requirements. 



8. Protein in excess of the above suggested amounts may 

 temporarily increase the milk yield, but it seems probable that 

 in many cases the influence of individuality is likely to be 

 more pronounced than the efl"ect of the protein consumed. 



9. Under the usual conditions, varying amounts of ]irotein 

 ajipear to be without influence upon the composition of the 

 milk. 



' Armsby, in Farmers' Bulletin No. 346, United States Department of Agriculture, expresses 

 substantially the same idea in allowing .05 of a pound of digestible true protein for each pound 

 of average milk, in addition to the maintenance requirement of .5 of a pound of digestible true 

 protein per 1,000 pounds live weight. It is possible that animals can even do very good work 

 with .04 of a pound of protein for each pound of milk. 



