GO Report of Department of A:mmal Industry of the 



from 10 days to 1 montli long. The average results were in 

 favor of hand milking in all the tests except one. 



Erf^ traced the history of the development of milking machines 

 and states that " From a series of thirty-tv^o tests to compare the 

 thoroughness of milking it was found that the average cow milked 

 by a machine is milked slightly cleaner than by average hand 

 milking." He does not give his data nor state the duration of 

 these tests but the context suggests that they were of brief 

 duration. 



Lane^ gave the results of a 30-day test of a milking machine on 

 two farms. The comparison was made by milking coavs by hand 

 and by machine during alternate 10-day periods. On a farm 

 where the cows had been milked with a machine for about three 

 years a slightly larger flow was obtained by the machine. On 

 the second farm where the machine had been used a shorter time 

 slightly more milk was obtained by hand milking. 



Beach^ studied the effect of a milking machine during nine 

 weeks and contrasted the observed shrinkage with that found with 

 hand milking. The shrinkage when the machine was used was 

 slightly larger than that observed with other cows by hand 

 milking. 



Mairs^ divided 10 cows into two equal lots, one being milked 

 by hand and the other by machine. At the end of four weeks the 

 manner of milking each lot was reversed. The experiment was 

 continued 16 weeks, changing the manner of milking at the end 

 of each four weeks. He states that " Xo difference in yield of 

 milk was observed that could be attributed to the milking ma- 

 chine, but there was usually a slight drop when changing from 

 one method to the other, always in changing from hand to ma- 

 chine milking." 



lErf, O. Milking machines. Kan. Agr. Exp. Station Bui. 140. 1906. 



2 Lane, C. B. Practical studies of a milking machine. U. S. Dept. Agr., 

 B. A. I. Bui. 92. 1907. 



3 Beach, C. L. Milking machines. Part II. Effect upon milk yield. Conn. 

 (Storrs) Sta. Bui. 47. 1907. 



4 Mairs, T. I. Test of a mechanical cow milker. Penn. Agr. Exp. Station 

 Bui. 85. Jan. 1908. 



