DISEASES OF THE MAMMARY GLAND. 133 



In most cases it disappears in a few days, the millc 

 becoming normal. Sometimes, however, it may assume 

 a chronic character, the milk mixed with pus, whilst the 

 mucous membrane of thegalactophorous sinus becomes 

 thickened and' feels like a firni cord ; the swelline 

 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- 



