PARASITE'S AND PARASITIC DISEASES OF HORSES 



33 



For practical purposes manure which has been kept in such con- 

 tainers for at least two weeks may be considered free from living eggs- 

 and larvae of parasites and may be safely spread on pastures. Several 

 manure boxes constructed on the above principles have been in opera- 

 tion at the Beltsville station of the Bureau of Animal Industry with 

 successful results. These boxes have double-walled doors to facilitate 

 the removal of the manure after it has been sterilized. 



Figure 23. — A, Box with double walls and double floor for sterilizing horse 

 manure : B, tight-fitting lid. The space between walls and floor must be 

 filled with sawdust to insure insulation 



In default of such measures, spread horse manure on fields which 

 are to be pastured by animals other than horses, or plow it under. 



SUMMARY OF CONTROL MEASURES 



The most common and most troublesome parasites of horses in the 

 United States live, at least part of their lives, in the digestive tract, 

 either free in the lumen, attached to the walls, or embedded in the 

 lining of the wall. These parasites produce eggs which pass out in the 

 manure on to pastures, the floors of stalls, and other places. All such 



