110 EXrEKLMKNT STATION. [Ian. 



per cent., being about the same increase as with Herd I. The 

 protein showed rather more of an increase than in case of Ilerd 

 L, and this may possibly be attributed to the inliuence of the 

 extra protein in the food. It must be remembered that Herd 

 1. received a ration deficient in protein, and the increased 

 amount given to Herd II. may have had a slight effect upon 

 the milk ])rotein. With this exception it is safe to state that 

 the ])rotein was entirely without influence upon the coni2)osi- 

 tiou of the milk. 



Experiment VII. — 1007-08. 



This ex})eriment was conducted with six cows, the only ones 

 available at the time, and was by the group method. 



The object of tlte cxperiinent was primarily to note the effect 

 of rations low and high in protein (a) upon the condition of 

 the animals, (b) upon the yield of milk, and (c) upon the rela- 

 tive milk shrinkage. 



The plan of the experiment consisted in dividing six cows 

 into two herds of three each, which were known as Herds D and 

 E. The first ten days were regarded as preliminary, to accus- 

 tom the two herds to their distinct rations. Herd D received 

 the low-protein ration and Herd E the one high in protein. 



Weighing Cows. — Each of the cows was weighed for three 

 consecutive days at the beginning and end of the experiment, 

 and every fourth week during its ])rogress. They were weighed 

 in the afternoon before being fed or watered. 



Snnipling Feeds. — The hay was sampled in the usual way 

 at the beginning of the experiment, and every two weeks there- 

 after. The urain was sam])led daily and ])roserved in glass- 

 stop])er('(l bnltles, and eventually tested for dry nuitter and for 

 the ordinary ingredients. 



Character of Feeds. — The liay was a mixture of grasses, the 

 finer varieties, such as Kentucky blue grass, predominating. It 

 contained a noticeable admixture of clover. 



Sampling Mill\ — The cows were milked twice (biily, and 

 the single milking of each cow in each herd was poured into a 

 common receptacle, mixed and the herd mixture sauqded. This 

 method was continued, for five consecutive days, each single 



