366 DISEASES OF CATTLE, SHEEP, GOATS, ETC. 



Calves 3% to 4 ounces. 



Yearlings 6 ounces. 



Two-year-olds and above 12 to 16 ounces. 



In making up the solution only clear blue crystals of bluestone 

 should be used. Bluestone with white patches or crusts should be 

 rejected. It is especially important that the bluestone and water be 

 accurately weighed and measured, and that the size of the dose be 

 graduated according to the age of the animal. 



Gasoline. Gasoline is one of the most popular remedies for 

 stomach worms which have been used in this country, and has the 

 particular advantage of being readily obtained. It is important to 

 repeat the dose if the gasoline treatment is employed, and it is usual 

 to administer the treatment on three successive days, as follows : 



The evening before the first treatment is to be given the animals 

 are shut up without feed or water and are dosed about 10 o'clock the 

 next morning. Three hours later they are allowed feed and water, 

 and at night they are again shut up without feed or water. The next 

 morning the second dose is given, and the third morning the third 

 dose, the treatment before and after dosing being the same in each 

 case. The sizes of the doses are as follows: 



Calves % ounce. 



Yearling steers 1 ounce. 



The dose for each animal is measured and mixed separately in 

 linseed oil, milk, or flaxseed tea and administered by means of a 

 bottle or drenching tube. Gasoline should not be given in water. 



Other Remedies. Many other remedies in addition to those 

 mentioned here have been used in the treatment of stomach-worm 

 disease with more or less success. Several of the coal-tar dips on 

 the market are recommended by the manufacturers for the treat- 

 ment of worms, and the action of some of them is much the same as 

 that of coal-tar creosote. 



It is not the policy of the department to recommend the use 

 of any particular proprietary remedy, and as the action of some such 

 agents is very uncertain it is suggested that, if it is desired to use 

 them, they be used with caution and only in accordance with the 

 printed directions on the package. Whatever remedy is used it is 

 wise to test it on two or three animals before the entire herd is 

 dosed. 



THE ENCYSTED STOMACH WORM (OSTERTAGIA OSTERTAGl). 



This parasite is as thick as a fine hair and less than half an inch 

 in length. It lives in small cysts in the wall of the fourth stomach 

 and is also found free in the cavity of the stomach. When nu- 

 merous, these parasites cause a thickening of the stomach wall and 

 disturb its digestive functions. The symptoms caused by this para- 

 site are very similar to those produced by the twisted stomach worm. 

 The life history of the encysted stomach worm is not known in 

 detail, but it is undoubtedly very much the same as that of the 

 twisted stomach worm. The same measures as recommended above 

 for preventing infection with the twisted stomach worm should be 



