258 



PARASITIC DISEASES 



The treatment is largely preventive. Frequent changing of 

 pastures and dry lot feeding are common preventive measures. 

 Permanent sheep pastures lead to heavy losses from stomach 

 worm disease. A very effective preventive measure, as we may 

 term it, is the practice of administering a vermifuge to the ewes 

 in the late summer and again in early winter. This may be 

 given in a drench, or with the feed. This prevents the reinfec- 

 tion of the pastures every spring, and the young lambs are not 



Via. 76. — Lamb affected with stomach worm disease. 



exposed to this form of infection. The most effective treatment 

 that the writer has ever used is the following fonnula recom- 

 mended ])y Dr. Law: Arsenous acid one dram, sulfate of iron 

 five drams, powdered areca nut two ounces, common salt four 

 ounces. This is sufficient for one dose for thirty sheep. It may 

 be given with the salt, or in ground feed. If the flock is appar- 

 ently healthy, four doses given at intervals of three days,, is 

 sufficient. If s^nnptoms of stomach worms are manifested the 



