°116 STORRS AGRICULTURAL EXPERIMENT STATION 
dairy room until needed. It was found that this treatment 
killed nearly all of the bacteria in the tubes. Occasionally 
a few living organisms were found by rinsing the tubes in 
sterile water just before milking time, but these perhaps were 
too few to have much effect upon the germ content of the milk. 
This steam treatment, however, was injurious to the rubber 
tubes and it was found after a few days sterilizing in this way, 
that the tubes became so weakened that it was difficult to keep 
them from dropping apart while they were in use. For this 
reason the sterilizing in steam does not seem to be satisfactory 
for the rubber tubes. 
But in spite of the fact that the machines were nearly sterile, 
the machine drawn milk normally contained more ‘bacteria 
than the corresponding samples drawn by hand. These results 
may be seen in Table 29. In all of the experiments up to this 
point, the teat cup connector used was one shown in ‘‘a”’ in 
Fig. 41. 

TABLE 209. 3 
Comparison of hand and machine drawn milk. All parts 
of machine sterilized in steam (without pressure) for one 
hour. New style of connectors with air relief used: No 
cotton filters. 













Ss er a a | ofs fa 
Sf | Method of = 3 26 AES | Bes 
Be salaak it fa ae ai Aci) 
1906 Machine} aA. wt.) *22,;L00Yeat70 892 535 
Nap 3 391 Hand A.M. | 52,400 8,250 650 6,850 
Jan. 3 396 | Machine P.M. END, Zio2o 180 1,600 
: Hand POM: eG 000 7 a Ss0 15 350 
Jan. 4 398 | Machine | a.m. | 27,990 | 9,140 150352 
Hand AL MAb eL3.7 10 hn S68hO arn La ee 580 
Jan. 4 404 |, Machine | p.m. | 15,660 | 4,760 360 275 
Hand P.M. 5,300 | 2,930 100 415 
Jan. 5 406 | Machine | a.m. | 43,450 |17,300 165 432,190 
Hand A.M:)| 28,125 |11;050 500 | 1,525 
Pp anees 416 | Machine | P.M. 9,560 | 1,480 540 940 
Hand P.M. | 38,440 | 1,490 25 350 
Averages ' Machine 19,984 | 6,529 38 Lota lees 
Hand S720: 24 th 444 1,678 



At this point a new style of connector (see ‘‘b” in Fig. 
Al) relief attachment was used. This allowed the air to 
rush in and relieve the suction in the teat cups and at the same 
7 
