AN UNUSUAL CAUSE OF UDDER DISEASE.* 
By Louis A. Klein, University of Pennsylvania. 
About the middle of November, 1911, the cows in a large 
dairy herd began giving milk containing small flakes and white, 
jelly-like clumps. At first only a few cows were affected, but the 
number gradually increased, until finally 90 per cent, of the cows 
gave milk of this kind. At this time the clumps and flakes w r ere 
* ) 
so numerous that the cotton strainer was clogged and the milk 
would not pass through. Usually the flakes were observed in the 
first part of the milking, but in some cases they did not appear 
until the middle or near the end of the milking. In a number of 
cases the condition was only temporary, disappearing in two or 
three days, but more often it persisted and the flakes became 
larger and more numerous. Some cows had only one-quarter af¬ 
fected, others two, three or all four. Difficulty was often expe¬ 
rienced in getting the milk started through the teat of the affected 
quarter, the canal apparently being blocked. Frequently this was 
the first sign of the trouble. The feeds were suspected by the 
manager as being responsible, but the ration was changed several 
times without effect. 
Two or three weeks after the condition appeared the writer 
made an examination of the herd. Forty-eight cows were found 
to be giving milk containing the white, jelly-like clumps and 
flakes. These, like the others in the herd, were in good physical 
condition and exhibited no pronounced symptoms of disease. 
There was no swelling of the udder, no pain on pressure, and no 
heat, except in one cow the point of the teat was rather hot. In 
a number of cases a red ring was observed around the opening of 
the teat canal, indicating congestion and swelling of the mucous 
* Presented to the Pennsylvania State Veterinary Medical Association, March 5, 1912,. 
at Philadelphia. 
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