1911.1 



PUBLIC DOCUMENT — No. 31. 



97 



In the first 2)eriod the milk of the two herds showed itself 

 to be practically identical in composition. In the second period 

 the substitution of 3 pounds of cottonseed meal for 4 pounds 

 of the standard ration, thereby increasing the digestible pro- 

 tein in the ration .86 of a pound, had no effect whatever in 

 varying the proj^ortions of the milk. It is well to remember 

 in this connection that nearly a month intervened between the 

 first and second }»eriodH ^, and that the period itself covered five 

 weeks. It is possible that, if the standard ration had contained 

 a pound less of digestible protein daily, some difference may 

 have been observed in the composition of the milk produced by 

 the two herds in the second period. 



Influence of Protein on Ike Milk Yield {Pounch). 



Herd Results, Second Period. 



In so far as this experiment throws any light on the protein 

 requirements, it indicates that Herd 1. was receiving ample 

 protein (65 per cent, above the minimum requirement), and 

 that the addition of more protein (122 per cent, above the 

 minimum) was without any noticeable influence upon the milk 

 yield. 



Experiment IV. 



This experiment was completed during the winter of 1897- 

 98, although the results have not been published. It was 

 conducted on the reversal method, with twelve mature grade 

 Jersey cows, all of Avhich had freshened the previous summer 

 and autumn. 



Weu/hiiif] Animals. — Each animal was weighed for three 



• This excessive lapse of time was due to some of the cows not being in best of condition. 



