BUREAU OF ANIMAL INDUSTRY. 123 



OTHER WORK. 



The Biochemic Division has continued to carry on, in cooperation 

 with the Insecticide and Fungicide Board, the examination of insecti- 

 cides and fungicides intended for use in connection with the diseases 

 of horses, cattle, sheep, swine, and goats. One hundred and three 

 samples were examined, of which 58 w^ere found to be misbranded. 

 A considerable amount of work was done by inspectors of the bureau 

 in assisting the board on this work. 



A number of different substances believed to be of value for the 

 treatment of animal diseases have been examined also. 



ZOOLOGICAL DIVISION. 



The investigation of parasitic diseases of animals and the study, 

 collection, and determination of animal parasites have been con- 

 tinued in the Zoological Division, under B. H. Ransom, chief. 



ROUNDWORMS OF SHEEP. 



In the work at the bureau farm near Vienna, Va., where a study is 

 being made of methods of handUng sheep to avoid losses from 

 stomach worms, successful results are being obtained under a plan 

 by which the lambs receive no medicinal treatment, the treatment of 

 the ewes and the rotation of pasturage being depended upon to pre- 

 vent injury to the lambs by stomach worms. This method has served 

 also to protect against trouble with other internal parasites as well 

 as stomach worms. Complete freedom from stomach worms and 

 other parasites has not been obtained, but the degree of infestation 

 has been exceedingly sUght. The investigations are being continued 

 with a view of being able finally to outline a definite scheme or 

 schemes for handling sheep that wall be effective in preventing losses 

 from stomach worms and at the same time wiU not be expensive or 

 unduly troublesome. 



TREATMENT AND CONTROL OF EXTERNAL PARASITES 



Ox WARBLES. — Observations and experimental work on ox warbles 

 were continued during the year, but the results were negative. 

 The application of various remedies by dipping or spraying failed to 

 protect cattle from infestation with these parasites. 



Cattle lice. — Field observations were continued and several 

 large herds of cattle were dipped for lice. The coal-tar creosote dips 

 were found to be very effective in eradicating cattle lice when reason- 

 ably good water was used. 



Hog lice. — Several series of experiments were made with hogs 

 infested with lice, and the results show that dipping is the most 

 effective method of applying treatment. Medicated hog wallows and 

 rubbing posts kept the number of parasites reduced so that they 

 caused little or no damage, but neither of these methods resulted in 

 complete eradication. Crude petroleum was used on the rubbing 

 posts, and the wallows were medicated with coal-tar creosote dips, 

 pine tar, crude petroleum, and bland oils. A one-half of 1 per cent 

 solution of pine tar in the waUows gave the best results. Crude 

 petroleum and coal-tar creosote dips proved to be more effective when 



