HORSE AND SHEEP BOT FLY 



6G7 



hastens death. Injections of tepid water may be employed to 

 allay pain and relieve the constipated condition which 

 accompanies turpentine poisoning. 



A simple drenching-tin for sheep, the invention of one 

 Armstrong, was described as follows in the Sydney Mail : 



" It is a tin cone, about 8 inches in length, about \\ inch 

 through at the butt, which is closed. At the 

 mouth or narrow end, which is about f inch 

 across, and open, the sharp edge is covered 

 by a ring, so that it will not injure the sheep's 

 mouth. Near the base of the cone, and 

 about \\ inch from the end, there is an 

 orifice I inch wide. The sheep are held, 

 and the operator having the drench stuff 

 in a bucket, dips the drencher, wide end 

 down, into the mixture. By this action 

 he instantaneously admits into the tin 

 about one ounce of the drench, and raising 

 it he is ready to pour the dose down 

 the throat of the sheep. The cone is, in 

 fact, a measure and drench combined. 

 The large opening freely admits the air, 

 the want of which is the great difficulty 

 met with when a bottle is used. Six or 

 seven men can easily drench three thousand weaners in a 

 day." 



The recent and more approved method of treatment is 

 the injection, directly into the trachea, of J to I drachm of a 

 turpentine and carbolic acid mixture, fully detailed at 

 page 239. 



The Sheep Bot Fly, (Estrus ovis, lays its eggs in the 

 nostrils of sheep from the middle of May to the end of July, 

 and, on hatching, the larvae crawl up the nostrils. The fly causes 

 as much excitement in a flock of sheep as the warble fly 

 does among cattle. The sheep become most uneasy, keep 

 their noses close to the ground and bury them in the dust 

 Sometimes they scatter in all directions to find shelter. At 

 other times they form into a dense pack, and those on the 

 outside stand with their heads in under cover. 



" The larvae crawl from the nostrils into the sinuses of the 

 skull. Here they cause irritation and inflammation of the 

 lining membrane, with the result that the animal has a 

 discharge from the nostril, and sneezes and coughs." 



FIG. 59. SHEEP 

 DRENCHING-TIN. 



