THE DIGESTIVE SYSTEM 21 



and myomas. Malignant tumors of the esophagus are 

 quite rare, and when they do occur they are secondary. 



STOMACH 



Malformations 



Malformations of the stomach are comparatively 

 rare in hogs. The stomach may be abnormally small 

 and sometimes there is a constriction in the middle line 

 producing the so-called hour-glass stomach. 



Foreign Bodies 



Foreign bodies in the stomach are comparatively 

 frequent because hogs have a marked tendency to swallow 

 objects of various kinds. The following was found in 

 one hog's stomach: 



40 nails. 1 No. 10 shotgun shell. 



15 staples. 2 buggy-top tacks. 



4 screws. 5 pieces of iron. 



4 nuts. 1 metal picture frame. 



9 pebbles. 6 pieces of zinc. 



1 snap. 8 pieces of wire. 



2 bolts. 1 piece of glass. 

 1 brass pin. 1 piece of brass. 

 1 piece porcelain. 



Hair balls (trichobezoars) are occasionally observed 

 in swine. 



The damage due to foreign bodies in the stomach of 

 swine depends upon their nature. Some sharp objects 

 inflict wounds of various dimensions, and in some in- 

 stances perforation occurs, succeeded by peritonitis. 



Lesions. The lesions will vary with the nature of 

 the foreign objects; in some cases there is only a catarrhal 

 condition, while in other instances there may be laceration 

 or even perforation of the stomach walls. 



Symptoms. Evidences of gastric foreign bodies are 

 by no means sufficiently distinct to differentiate this 

 condition from various other gastric disorders. 



Treatment. Little is available in the form of 

 treatment of swine that have ingested foreign bodies. 

 Small objects may be expelled by vomition excited by 



