GUAM AGRICULTURAL EXPERIMENT STATION. 33 



STOMACH WORMS OF CATTLE. 



A parasite which as yet has not been positively identified, but is 

 thought to be the IIo'inoTichus contortus^ has been found here only 

 in one case, that of a native cow. The cow manifested the symptoms 

 characteristic of this parasite. On post-mortem examination, the 

 parasites were found in large numbers in the abomasum. This has 

 been the only case observed, and, as the parasite does not seem to be 

 very widely disseminated, work on it must for the time necessarily 

 remain suspended. 



DISEASES OF SWINE. 



With swine, as with the other domestic animals of Guam, the effect 

 of internal parasites is of a serious nature. ^A^ien looked at from 

 an economic standpoint, the seriousness of parasitic infestation can 

 hardl}^ be overestimated. The average native hog is thin, under- 

 sized, and generally unthrifty. The presence of numerous blood- 

 sucking parasites, or parasites that rob the host of intestinal nour- 

 ishment, are largely responsible for this condition. The following 

 conditions favor the production of a large number of the various 

 parasites: Excessive rainfall, slight variation in temperature, use of 

 low, swampy pastures containing stagnant water, and the tendency 

 of the native live-stock owners to give- no heed to proper food or 

 water supplies. 



THE COMMON LARD WORM. 



A parasite commonly spoken of as the lard or kidney worm 

 {Stephanurus dentatus) has been found in the kidneys proper, the 

 perirenal fat, the lymph glands, the pancreas, the liver, and the 

 lungs of hogs. The parasite establishes an inflammatory condition, 

 followed by pus formation with the existence of multiple abscesses 

 and finally a necrosis of tissue. The seat of invasion is surrounded 

 by dense, fibrous connective tissue which has embedded in its mass 

 numerous necrotic centers harboring the parasite and containing 

 purulent material. In later stages, when the parasite can no longer 

 be found, the purulent material assumes a caseous nature. The symp- 

 toms set up b}'' this parasite are variable and confusing, because gen- 

 erally other parasitic infestations, such as flukes and lungworms, are 

 present at the same time. 



LUNGWORMS. 



A parasite answering the description of the Strongylus paradoxus 

 is frequently found infesting hogs. As far as observations have ex- 

 tended, it appears to be the most serious and fatal disease found 

 among the swine of the island. The condition set up by this parasite 



