130 MASTITIS OF THE COW 



mycosis or colibacillosis or a mixed infection which is more 

 common. This can be determined with the microscope. 



The wound secretion can be serous and red or grayish- 

 red or thick fluid yellow pus. The walls of the wound are 

 firm and more or less thick. The inner side is smooth, 

 uneven or warty. 



If the walls of the wound are not red, but white, or green 

 from gangrene, a chronic infection is indicated. It may be 

 pyobacillosis, tuberculosis or actinomycosis. 



These wounds present the same appearance as described 

 in the previous chapter on clinical diagnosis. In addition 

 one sees the specific lesions of these diseases in the cut sur- 

 face, walls of the wound and in the adjacent tissue. 



SOLIDIFICATION OF THE UDDER 



These lesions can be produced by bruises or by infection. 



An intense red coloring of the cut surface is indicative 

 of a fresh bruise or an acute infection. 



Fresh Udder Bruises. — The udder shows a hard cir- 

 cumscribed swelling. The incision is juicy, and the juice 

 of the incision consists of unaltered milk or milk partly 

 mixed with blood. The cut surface likewise presents a cir- 

 cumscribed altered area which is even, firm but friable. 

 It is red in color, but shows a distinct outline. A few lobuli 

 are red, due to blood infiltration following hemorrhage, 

 others are yellowish-gi-ay and show no milk points. The 

 cisterns and milk-ducts contain unaltered milk or milk 

 mixed with blood. 



Acute Udder-infections. — These concern the milk- 

 infections : parenchymatous mastitis, acute streptomycosis, 

 staphylomycosis and colibacillosis. 



The quarter is more or less swollen and firm. The 

 incision is juicy, and the juice consists of yellow pus. The 

 entire cut surface or only its inferior portion is even but 



