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cirxrLAR i4S, r. s. department of agriculture 



oil 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 I 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. 

 American Army vet- 

 erinarians have pro- 

 posed a substitute 

 purgative of castor 

 oil and neutral oil 

 (mineral oil) instead 

 of linseed oil. It is 

 c 1 a i m e d that this 

 mixture when used 

 with oil of chenopo- 

 dium provides suit- 

 able purgation and is 

 without the undesir- 

 able effects of raw 

 linseed oil. The fol- 

 lowing are the recom- 

 mended doses, of the 

 mixture : For wean- 

 lings, castor oil. I to 

 6 ounces, and neutral 

 oil. 1 pint; for year- 

 lings 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. l 1 ^ pints. 



Carbon tetrachloride is also of value for the removal of large 

 strongyles. It should be used in treating pregnant mares as oil of 

 chenopodiirm 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, after a fast of 18 to 21 hours. One treatment with any 

 drug will not always remove all worms present, and. if necessary, 

 treatment may be repeated in from four to six weeks. 



Prevention. — Preventive measures designed to control strongyles 

 consist (1) in rotation of pastures, so far as possible, avoiding low 

 and wet pastures, and (2) sanitation of stables to prevent larvae from 

 developing to the infective stage and from contaminating the feed 

 and water. This is accomplished by daily removal of manure from 

 stables, supplyino: the feed in boxes and racks well raised above the 

 floor, and supplying clean water. The disposal of stable manure is an 



Figuee 17. — Horse suffering from gross infestation vrith 

 parasites i strongylidosis) . Xote marked emaciation. 

 Following treatment for the removal of parasites, this 

 horse made a good recovery 



