24 



CIRCULAR, 14 8, U. S. DEPARTMENT OF AGRICULTURE 



on weight, regain their working capacity, and make an all-round 

 improvement. 



Treatment. — It is advisable to fast the animal 36 hours before 

 treating for large strongyles. Oil of chenopodium is effective for 

 their removal. This drug should be given in a dose of from 4 to 

 5 fluid drams (16 to 20 cubic centimeters) for a 1,000-pound animal, 

 or at a dose rate of 1 fluid dram (4 cubic centimeters) for each 250 

 pounds of weight, immediately preceded or followed by 1 quart of 

 raw linseed oil or by an aloes ball. Cases of excessive purgation 

 have been reported in some instances following the use of raw linseed 

 oil. It is possible that this undesirable action is due to impurities in 



the product; conse- 

 quently a good grade 

 of oil should be used. 

 A mixture, said to be 

 without the undesir- 

 able effects of raw 

 linseed oil, has been 

 recommended as fol- 

 lows : For wean- 

 lings, castor oil, 4 to 

 6 ounces, and neu- 

 tral oil, 1 pint; for 

 yearlings and 2-year- 

 olds, castor oil, 6 to 

 8 ounces, and neutral 

 oil, 1 pint; for 3- 

 year-olds and older, 

 castor oil, 8 to 10 

 ounces, and neutral 

 oil, 13/2 pints. 



Carbon tetrachlo- 

 ride is also of value 

 for the removal of 

 large strongyles. It 

 should be used in treating pregnant mares as oil of chenopodium is 

 dangerous for such animals. It may be given in doses of 6 to 12 

 fluid drams (25 to 50 cubic centimeters) for a 1,000-pound animal. 

 Normal butylidene chloride is another drug which is effective for 

 the removal of large strongyles. It should be given in a dose of 3 

 fluid ounces (90 cubic centimeters) for a 1,000-pound animal, and 

 followed in five hours by raw linseed oil at the rate of 1 quart per 

 1,000 pounds of weight. It is probable that the dose of normal 

 butylidene chloride could be reduced to 2.5 ounces (75 cubic centi- 

 meters) for a 1,000-pound animal, without materially reducing the 

 efficacy of the drug. One treatment with any drug will not always 

 remove all worms present and, if necessary, treatment may be re- 

 peated in from four to six weeks. 



As a supplement to worm treatment, distinct benefit has been 

 obtained from the use of tonic drugs such as sodium cacodylate or 

 ferrous sulphate. Such drugs aid in the formation of red cells and 

 hemoglobin and assist the animal to overcome the anemia associated 

 with strongyle infestations. Sodium cacodylate is recommended for 

 use in subcutaneous injections in a dose of 45 grains in 10 cubic 



Figure 17. — Horse suffering from gross infestation with 

 parasites (strongylidosis). Note marked emaciation. 

 Following treatment for the removal of parasites, this 

 horse made a good recovery 



