DISEASES OF THE MAMMARY GLAND. 13T 
In most cases it disappears in a few days, the milk 
becoming normal. Sometimes, however, it may assume 
a chronic character, the milk mixed with pus, whilst the 
mucous membrane of the galactophorous sinus becomes. 
thickened and feels like a firm cord; the swelling 
extending from the sinus to the other parts of the 
gland. Localized thickening and induration of the © 
udder may result from the disease in the smaller ducts 
becoming chronic. In some cases the inflammation 
may lead to stenosis or occlusion of the milk ducts ;, 
the affected sections of the gland become changed, the. 
induration extending as far as the skin. Abscess. 
formation is not often seen. 
Causes.—Chills, changes in the milk in the udder, 
causing it to become irritant ; micro-organisms. 
Treatment.—Instruments introduced into the ducts. 
and galactophorous sinuses should be carefully disin- 
fected. Withdraw milk frequently, and at the same 
time massage will be found to assist discharge from the 
finer ducts. The udder should be kept warm, annointed 
with some simple unguent, and protected with wad-. 
ding. 
In enzootic outbreaks, it is better to segregate the. 
diseased animals, and provide against transmission by 
the milker’s hands. Disinfectant injections can be used 
when the disease is clearly infectious. 
MASTITIS APOSTEMATOSA (PURULENT INFLAMMATION OF 
THE UDDER). 
In this form the inflammation also originates in the 
milk ducts and alveoli, but instead of remaining con- 
