110 EXPERIMENT STATION. [Jan. 



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

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

 L, and this may possibly be attributed to the influence 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 11. may have had a slight eftect upon 

 the milk protein. With this exception it is safe to state that 

 the protein was entirely without influence upon the composi- 

 tion of the milk. 



Experiment VII. — 1907-08. 



This experiment was conducted with six cows, the only ones 

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



The object of tlie experiment was jJrimarily to note the effect 

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

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

 tive milk shrinkage. 



TJie plan of the experiment consisted in dividing six cows 

 into two herds of three each, wdiich 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. 



Wcighi7ig 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 progress. They were weighed 

 in the afternoon before being fed or watered. 



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

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

 after. The grain was sampled daily and preserved in glass- 

 stoppered bottles, and eventually tested for dry matter and for 

 the ordinary ingredients. 



Character of Feeds. — The hay w^as a mixture of grasses, the 

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

 contained a noticeable admixture of clover. 



Samplinrj MiU\ — The cows were milked twice daily, and 

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

 common receptacle, mixed and the herd mixture sampled. This 

 method was continued for five consecutive days, each single 



