812 DISEASES OF CATTLE. 



i 



INTERNAL PARASITES, OR ENTOZOA. 



HOOSE, HUSK, OR VERMINOUS BRONCHITIS. 



This common and frequently fatal disease is due to the presence 

 in the windpipe and bronchial tubes of the strongylusmicrurus, one 

 of the five species of strongyli which infest cattle. It is chiefly 



Fig. 1069.— Ox-louse. 



(Hsematopinus.) 



Fig. 1070.— Ox-louse. 



(Hsematopinus Eurysternus.) 



Fio. 1071.— Calf-louse. 

 (Trichodectes of Ox.) 



met with among^calves, especially those pastured in low-iying lands, 

 and occurs most frequently in August and September. 



Symptoms— -There is considerable: irritation of the air passages, 

 shown by frequent coughing or husking, as if trying to dislodge 



Fig. 1072. 



Calf-louse. 



Fig. 1073. — Dermatoeoptes. Fig. 1074. — Gamasus of Fodder. 



(Hsematopinus Vituli.) ' 



some annoying substance in the throat. The cough is remarkably 

 forcible, distressing, and of a paroxysmal character. The animal 

 becomes emaciated, diarrhea sometimes setting in. The parasites 

 block up the air passages, seriously impeding respiration, and 



