44 DEHORNING OF CATTLE 



the matrix of the horn is supplied principally by two 

 branches from the common carotid, one of which curves 

 around the base of the horn in the front, the other behind. 

 If one of these should be split longitudinally, the vessel 

 may be unable to retract, and may bleed profusely. The 

 hemorrhage may be controlled by compression forceps, by 

 sutures, or by a ligature surrounding the poll and drawn 

 tightly in a manner to compress the chief arteries of the 

 horn as shown in Figs. 12, 13. 



If the excision has been made too peripheral and the 

 intra-osseous vessel severed, the hemorrhage may be con- 

 trolled by a ligature about the poll as suggested above, or 

 by inserting into the mouth of the wounded intra-osseous 

 vessel, a conical peg of wood and pressing it in firmly. 



Any adherent pieces of fractured bone should be removed. 

 No antiseptics or other drugs or substances should, as a 

 rule, be applied. The blood washes them away from the 

 actual cut surfaces and they largely fall into the frontal 

 cavity to cause irritation and harm. The blood and lymph 

 which quickly dry constitute a splendid protective covering. 



9. LIGATION OF THE PAROTID DUCT 

 Fig. 14 



Objects. The destruction of the parotid gland in case of 

 incurable fistula from wounds or abscesses. 



Instruments. Razor, convex scalpel, straight probe- 

 pointed scalpel, tenaculum forceps, ligation forceps, tena- 

 cula, needle holder, probe, suture and dressing material. 



Technic. in case of salivary fistula, insert a probe toward 

 the gland through the fistula into the duct and with a sharp 

 scalpel lay the duct free for a distance of from i tiD 2 cm. on 

 the glandular side of the fistulous opening. If the fistula 

 has its location on the side of the cheek, cast the horse and 



