290 



Diseases of the Genital Organs 



calves is markedly below the average among heifer calves 

 of corresponding ages in eastern dairy herds. Western veal 

 calves largely run at liberty in the open, exposed only to the 

 infection from their dams. 



When the nodules are quite numerous, they tend to be- 

 come arranged in longitudinal, parallel rows corresponding 



FlG. Si Vulva of Heifer Grown Experimentally upon Boiled Milk. 

 The vulvar tuft of hairs is unstained and free from muco ]>us. 



to the longitudinal folds of the vulvar mucosa, as shown in 

 Fig. 79. The nodules are located upon the summits of the 

 rugae, emphasized and rendered more distinct by the in- 

 flammation of the mucosa, which causes it to swell, harden 

 and thicken, and forces it into marked folds. The individual 

 nodules change in appearance. They increase little in size 

 and projection. The vascular areas about their liases be- 

 come more deeply injected and the vascularity may extend 



