12 STORRS AGRICULTURAL EXPERIMENT STATION. 
There is also a very marked difference in the number of acid 
producing organisms in the two kinds of milk, this difference 
usually being decidedly in favor of the milk drawn before 
the feeding was done, there being an average difference of 
530 acid producing bacteria per cubic centimeter in favor of 
the milk drawn before the cows were fed. The same rela- 
tion exists even more strikingly in the liquefying or peptoniz- 
ing group of bacteria as shown in the last column of the table. 
In every experiment the milk drawn after the feeding was 
done contained larger numbers of this group of organisms than 
did the corresponding milk drawn before feeding, the average 
being an increase of more than 80 per cent. The results of 
these experiments show that the amount of dust produced in 
the stable by feeding hay and dry grain causes a decided in- 
- crease in the number of bacteria which gain access to the milk 
and from a sanitary standpoint it is a bad practice to feed these 
materials until after the milking has been completed. 
feeding dry corn stover at milking time.—'The effect of the 
increased dust caused by feeding hay and grain was so marked 
in the foregoing experiments that it was thought desirable to 
determine the effect of feeding dry corn stover just before milking. 
In, these experiments two cows standing side by side were used. 
They were both milked by the same man into the Stadtmueller 
covered milk pail. One was milked before any feeding was 
done. Dry corn stover was then fed to the stock in that section 
of the barn and the other cow milked immediately. The order 
of milking the two cows was alternated each day in order to 
prevent any error which might be due to the difference in germ 
content of the udders of the two cows. Thecorn stover which 
was used in these tests was of extra fine quality and contained 
a much smaller amount of dust than corn stover usually con- 
tains. The stover was put down into the feeding alley from 
the floor above an hour or two before milking time and left in 
a pile in the alley. From this pile it was taken to the different 
animals ina bushel basket. This did not produce nearly as 
much dust in the air at milking time as there would have been 
had the stover not been put down until it was needed for feed- 
ing. In Table No. 21 are given the results of these experi- 
ments. 
La, 
