Texas Fever 373 



ern cattle in solutions, and various other means, have 

 been tried for destroying the cattle -ticks, without suc- 

 cess. Recent experiments, however, give promise that 

 a dip will soon be perfected that will destroy the ticks. 

 One attack of Texas fever gives immunity, and young 

 calves are not so susceptible to the disease as are older 

 animals. It is probable that the reason that southern 

 cattle do not have Texas fever is because their im- 

 munity was acquired as very 5'oung calves at an age 

 when they do not seem to be seriously affected by the 

 disease. 



The Missouri and Texas Experiment Stations have 

 devised a method of conferring immunitj^ on susceptible 

 cattle intended for shipment into permanently infected 

 territory. It is by injecting serum obtained from the 

 blood of immune cattle, and is very successful. Cattle 

 intended for such shipments should be young, and 

 should be taken in the fall, when the ticks are not so 

 numerous and the weather is cool. 



When an outbreak of Texas fever occurs, there is 

 no danger to cattle in the surrounding territory, pro- 

 vided they are kept off infested ground. It is com- 

 monly said by stockmen that "a wire fence will stop 

 the spread of Texas fever," but it is safer to put a 

 greater barrier, in the way of distance, as the young 

 ticks may be washed short distances, or cattle may 

 break through a fence and carry the ticks. After 

 an outbreak of Texas fever, no susceptible cattle 

 should be allowed on the infested pasture or quar- 

 ters until the ticks have been destroyed by the cold of 

 winter. 



