24 CIRCULAR 148, 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 oul, 1 pint; for 
yearlings and 2-year- 
olds, castor oil, 6 to 
8 ounces, and neutral 
onl: dsspimt >; torso" 
year-olds and older, 
castor oil, 8 to 10 
ounces, and neutral 
oil, 114 pints. 
Figure 17.—Horse suffering from gross infestation with : Carbon tetrachlo- 
parasites (strongylidosis). Note marked emaciation. ride is also of value 
Fe eee Ge lame removal of parasites, this for ther 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 gales Oy 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, tre atment 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 
