1911.J PUBLIC DOCUMENT — No. 31. 89 



animals — 20 or more - — is available. \Vitli a less number 

 the influence of individuality is altogether too pronounced. 



8. An excess of 30 per cent, of digestible crude ])r()tein 

 above the protein minimum (equal to 1.80 pounds of protein 

 per day) will be productive of satisfactory results in case of 

 cows weighing 900 pounds and i)roducing daily 12 quarts of 4 

 per cent, milk.^ 



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

 the protein miniuuim is believed to be ample for all ordinary 

 requirements. 



9. Protein in excess of the above-suggested amounts may 

 temporarily increase the milk yield, but it seenis probable that 

 in many cases the influence of individuality is likely to be more 

 pronounced than the effect of the protein consumed. 



TO. Under the usual conditions, varying amounts of protein 

 appear to be without influence upon the composition of the 

 milk. 



' Armsby, in Farmers' Bulletin No. 346, United States Department ot 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 .5of a pound of digestible true 

 protein per 1,000 poimdslive weight. Tt is possible that animals can even do very good work with 

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



