136 MASTITIS OF THE COW 



Udder-bruises and acute infections in the state of heal- 

 ing may be mistaken for chronic streptomycosis. The fol- 

 lowing characteristics are important for a differential 

 diagnosis : 



Udder-bruises in State of Healing. — The udder 

 presents a nicely circmnscribed hard swelling. The cut 

 surface in this part is even, whitish-gray and of tendinous 

 consistency. In the other portions both the udder and the 

 milk are unchanged. 



The Acute Infections in the State of Healing. — 

 The udder is somewhat swollen and hard. The incision is 

 succulent, and the juice consists of a mixture of unaltered 

 milk and yellow pus. The cut surface is usually convex 

 and the consistency somewhat soft and elastic. Here and 

 there among the normal lobuli there are groups of yellowish- 

 gray non-protruding lobuli without milk points, which are 

 of firm but friable consistency. With pressure applied to 

 these altered lobuli pus is expressed. 



Summary 



1. Post-mortem technic. 



Ablation of the udder. 



Position for examination. 



External examination. 



Lymph-gland. 



Teats. 



Cut surface of the udder. 



2. Post-mortem diagnosis. 



A. Infected wounds. 



1. The walls of the wound when red colored, streptomycosis, 



staphylomycosis, colibacillosis. 



2. The walls of the wound when not red colored, pyobacil- 



losis, tuberculosis, actinomycosis. 



B. Solidification of the udder. 



