1911.1 



rUBLlC DOCUMENT — No. 31. 



97 



lu tliG lii'st period the milk of the two herds showed itself 

 to be practically identical in composition. In the second period 

 the sidjstitution of o pounds of cottonseed meal for 4 pounds 

 of the standard ration, thereby increasing the digestible pro- 

 tein in the ration .80 of a pound, had no etlect whatever in 

 varying the proportions of the milk. It is well to remember 

 in this connection that nearly a month intervened between the 

 lirst and second periods ^, 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 diiference may 

 have been observed in the com})osition of the milk produced by 

 the two herds in the second period. 



Influence of I'rotein on the ISLilk Yield {Pounds). 



Herd Results, Second Period. 



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

 recpiirements, it indicates that Herd I. Avas receiving ample 

 protein (05 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 which had freshened the previous summer 

 and autuiun. 



Weifjhiiif/ 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. 



