FARM ANIMALS 283 



this consists in injecting a mixture of olive oil and 

 turpentine into the windpipe. This remedy, how- 

 ever, suffers from the serious objection that it 

 takes altogether too much time and the best way 

 to control the disease is by the use of preventive 

 measures, such as are recommended for the 

 stomach worm. 



Sheep occasionally become affected with a sort 

 of blood poisoning as a result of cutting with dirty 

 shears at the time of shearing. The disease runs 

 a rapid course and is characterized by swellings 

 and intense inflamation near the cut part. There 

 is no cure for this disease but the trouble may 

 obviously be prevented by the use of clean shears. 



All sheep are subject to liver flukes which cause 

 the so-called liver rot. This flat parasitic worm 

 is also taken into the stomach on grass eaten along 

 the edges of ponds. Attention should always be 

 given to the condition of waterways in pastures 

 in which sheep are kept in order to prevent infection 

 by these parasitic worms for most of them are ac- 

 quired by eating soiled grass in pastures. 



Similarly with the common tape worms of sheep 

 which sometimes occur in such numbers as almost 

 to obstruct the passages in the intestines as well as 

 in the bile ducts of the liver. These parasites are 

 also taken into the stomach on grass infested by 

 a young form of the tape worm which comes in 

 turn from infested dogs. This indicates the desir- 

 ability of keeping all useless dogs out of sheep 

 pastures and of treating for tape worms all dogs 

 which are used for herding sheep. The best 

 vermifuge for use in expelling tape worms from 

 sheep is the areca nut which may be given in doses 

 of one to three drams. 



Sheep are also attacked by a parasitic worm 



