Pathological Anatomy of the Udder. 



The principal producers of mastitis are the colon-paratyphoid 

 group, staphylococci, streptococci, Bacillus pyogenes bovis, Bacillus 

 tuberculosis, and the actinomyces. 



Colon infection and severe mixed infections usually result 

 from galactiferous contact, or after the introduction of milking 

 tubes, straws, quills, cat-guts, and hairpins. Highly acute, inflam- 

 matory conditions develop in the affected quarters, whether af- 

 fected throughout or only partially with parenchymatous mas- 

 titis. Hot, painful swellings of the quarters, with collateral edema 



Fig. 1. 



Acute inflammation of the right forequarter with collateral edema. 



(After Kitt.) 



of the surrounding tissues, are the associating symptoms of this 

 form of inflammation, which either results in recovery with atrophy 

 of the affected parts of the udder, or with regeneration of 

 the epithelia destroyed by the disease or on the other hand the di- 

 sease becomes chronic and may even terminate with complete gan- 

 grenous and ichorous destruction of the affected part of the udder. 



In the infectious forms of mastitis the supramammary lymph glands may swell to 

 fist-sized nodes. 



If the process becomes chronic a suppurative softening of the 

 affected parts of the tissue, or a suppurative demarcation of ne- 

 crotic parts of the tissue results. These conditions are designated 

 as suppurative and purulent mastitis respectively. 



