PARASITES AND PARASITIC DISEASES OF HORSES 



51 



a practical field test for such dip. Of the various classes of dips used 

 on horses, three only are on the approved list — arsenicals, lime-sul- 

 phur, and nicotine. Of these the two most commonly used are the 

 lime-sulphur dip for 

 mange and the ar- 

 senical dip for lice 

 and ticks. 



ARSENICAL DIP 



Arsenical dip, 

 when properly used, 

 eradicates biting and 

 sucking lice, but it is 

 not an effective rem- 

 edy for" mange. Pre- 

 pared arsenical dips 

 have been placed on 

 the market, but those 

 which are permitted 

 by the Government 

 for use in dipping 

 cattle for southern 

 fever ticks are suit- 

 able for use in dip- 

 ping horses, mules, 

 and asses for lice. 

 The instructions on 

 the label of the con- 

 tainer should be fol- 

 lowed in diluting and 

 using ready-prepar- 

 ed dips. The arseni- 

 cal dip is not usually 

 warmed or heated in 

 the vat. 



It should be remem- 

 bered that arsenical 

 dip is a poison, and 

 precaution should be 

 taken to prevent in- 

 jury to man or ani- 

 mal. When it is 

 handled and used with proper care it is a safe and effective remedy. 

 Care should be taken not to get the clothing wet with the dip, and the 

 hands should be washed frequently to prevent possible absorption of 

 arsenic. 



Freshly treated animals should be held in the draining pens or 

 other suitable place until all surplus dip has drained off. (Figs. 34 

 and 35.) If allowed to drain where pools of dip collect from which 

 the animals may drink, or if the pasture or feed becomes soiled with 

 arsenical dip, losses are liable to occur. 



If homemade arsenical dip is preferred to the proprietary brands, 

 see United States Department of Agriculture Farmers' Bulletin 1057 

 for full instructions for making it. 



Figure 34. 



-Exit incline and draining pens of horse- 

 dipping vat 



