﻿IX. B, 3 Boynton: Kidney-ivorm Infestatiori of Swine 285 



SUMMARY 



1. From the specimens procured from hogs by me and from 

 identification of the same by H. B. Ransom, it is proved that 

 the animals were infested with Stephanurus dentatus. 



2. From observations made by R. W. Newcomb and by A. S. 

 Shealy on native hogs killed at the matadero in Manila and from 

 identifications made by me of specimens collected by them from 

 about 25 cases, it is proved that Stephanurus dentatus infesta- 

 tion is prevalent among the native pigs slaughtered there. 



3. The age at which pigs usually die from infestation with 

 Stephanurus dentatus, as observed by me, and the lesions pro- 

 duced by this worm indicate a slow-developing, chronic disease. 



4. Since the average age of pigs that are killed for meat at 

 the Manila matadero varies from six months to one and a half 

 years, the disease does not have time to cause any fatal or very 

 damaging lesions in the animals. Hence it is not looked upon 

 as very serious in connection with meat inspection. In older 

 animals, the lesions are more serious. 



5. From the several autopsies made on animals, it is con- 

 cluded that kidney-worm infestation becomes a generalized in- 

 stead of a localized disease of swine when allowed to run its 

 course. Practically every cavity of the body may become in- 

 fested. 



ACKNOWLEDGMENT 



The writer is indebted to Mr. H. B. Ransom, chief, zoological 

 division, Bureau of Animal Industry, Washington, D. C, for 

 identification of the parasite and other information. 



Dr. R. W. Newcomb and Dr. A. S. Shealy assisted in collecting 

 information and material for study. 



Mr. L. J. Fattey, foreman on the Alabang stock farm, furnished 

 the history of several animals mentioned in this paper and 

 promptly notified me in cases where animals were either sick 

 or dead. 



