98 lIvLINOIS STATE DAIRYMEN'S ASSOCIATION. 



others. If the weather changes from warm to cold, it causes 

 shrinkage in the flow and then the per cent rises. There are a 

 great many things in this connection. 



Mr. Monrad: Wouldn't it happen in an individual cow if 

 the boys were in a hurry and don't milk clean.^ 



Prof. Eraser: Yes, or if a cow is milked later at one time 

 than another, the period is longer and the milk would be poorer 

 in fat. 



A Member: How much difference is there in changing the 

 feed when you take them out to pasture, or in the fall when you 

 bring them in again. ^ 



Prof. Fraser: That is difficult to say except in a general 

 way. Sometimes when the cows are turned out on pasture the 

 test goes down, but the amount of milk necessarily comes up, 

 even if the cows have grain during the winter, and you take it 

 away when you turn them out. They get a change of feed, 

 they like it better, and eat more and assimilate more, and this 

 question depends on what she is going to eat and assimilate, 

 because if she don't assimilate it she don't get it into milk. 



The Chairman: What time were those cows milked.^ 



Prof. Fraser: Milking commenced at 4 o'clock in the morn- 

 Jing and 3 o'clock in the afternoon, and they are always milked 

 iin the same order. One period was thirteen hours and the other 

 ^was eleven. 



A Member: To get the best results, what should be the 

 ^specific gravity of the acid in this test.^ 



Pxof. Fraser: It should be between 1.82 and 1.83; take the 

 rcommercial sulphuric acid, as usually found, it will run between 

 those two. 



A Member: Will a difference in temperature make a differ- 

 ence in the test.^ 



Prof. Fraser: In so far as you do not get a good, clear test, 

 it does; that will happen if you have too high a temperature, or 

 too low a temperature. It ought to be pretty nearly 60, though 

 it can vary twenty degrees without any special difficulty. If 

 your acid happens to be a little strong and your acid and milk 



