16 



The foregoing results show that the total actual milk yield of the 

 four cows during four months was 8,378 pounds. The calculated yield 

 of milk was 8,333, making a difference between the actual and calcu- 

 lated of 45 pounds, or .53 per cent. — a little over one-half of one per 

 cent.* This we consider near enough for all practical purposes, and indi- 

 cates that the records of the cows calculated from weekly weighings are 

 substantially correct for weights of milk. 



Notes. 



Cows No. 66, 96 and 97 (Ayrshires) were frequently changed during 

 the year from hand to machine and from machine to hand milking. Al- 

 most invariably the change from hand to machine milking caused a de- 

 crease in the daily milk flow of from two to four pounds milk per cow, 

 while a change from machine to hand milking seemed to cause an in- 

 crease of like amounts. Two of these cows have short teats and are pos- 

 sibly the most difficult cows in the herd to milk by hand, hence we were 

 specially anxious to milk them with the machine, but they did not take 

 to it very well. They offered no resistance to the machine in the way of 

 kicking, but they did not let their milk down well. In the case of No. 

 97, if the operator commenced to "manipulate the udder" the flow of 

 milk would stop at once and the cups would immediately drop off. 



On September 20th cows No. 97 and 66 gave 63 pounds milk for 

 the day. With the machine they gave 29 pounds, and by "stripping" 

 after the machine, 34 pounds were got from the two cows. They were 

 put on hand milking next day. The second day after, they gave 68 pounds 

 milk. The day after machine milking the weights of milk by hand milk- 

 ing were much the same as when milked by machine. 



Cow No. 101, a grade Jersey, had been giving about 26 pounds milk 

 per day during the month of June. At the first time of weighing for the 

 next month (July 2) she had dropped to 11 pounds, without any apparent 

 reason, except that it may "have been due to more or less excitement dur- 

 ing the excursions. She was immediately put upon hand milking. She 

 never returned to her normal flow, but continued milking until November. 

 During July she gave from 12 to 15 pounds milk daily. Our herdsman 

 was confident that had she been continued on the machine she would 

 have been dry by the end of July. 



On July 10th, Nos. 106 and 107 (Holsteins) gave 27, pounds as 

 "strippings" after milking with the machine. The total yield of milk 

 from the two cows on that date was 57 pounds. On the nth about half 

 the yield was in the form of "strippings." On July 12th both these cows 

 were put on hand milking, when the yield was increased to 65 pounds. 

 However, this Increase was in part, at least, only temporary, because on 

 the 13th the yield had dropped to 62 pounds, and on the 15th it had 

 dropped to 57 pounds, or the same as it had been when they were milked 

 with the machine on July 10th. Both of these cows were more or less 



