FOOD EFFECT ON MILK SECRETION. 



229 



A diminution of the quantity, and frequently it does not return to normal 

 after the animal has gotten well. 



The effects of an overfeed is shown in table 6, below, the overfeed hav- 

 ing been given March 11, the dates following showing fluctuation until a 

 normal condition was again established. 



TABLE 6. 



EFFECT OF TUBERCULIN. The. effect of tuberculin has been noted by 

 a number of writers, and has been made the subject of special experi- 

 mental research at three different experiment stations. The result of all 

 the work is to show that tuberculin probably has no effect upon the quan- 

 tity or quality of milk. That equal or greater changes may take place 

 at any time without the injection of tuberculin. In some cows the quan- 

 tity of milk is slightly increased, and in others it is decreased. The prin- 

 cipal experiments to determine the effect of the tuberculin injection have 

 been conducted at the Cornell and North Dakota experiment stations. 



EFFECTS OF DEHORNING. The effects of a surgical operation, such as 

 dehorning, upon the milk flow is of only a temporary character. The effect 

 of dehorning has been observed at several of the experiment stations, and 

 the effect has usually been of temporary shrinkage in the milk, lasting only 



