A TICK-UESISTAXT CUNDITION IN CATTLE* 



By T. Harvey Johnston, M.A., D.Sc, and 



M. J. Bancroft, B.Sc, Walter and Eliza Hall Fellow in 



Economic Biology, Biology Department, 



Universit}', Brisbane. 



Jtead before the Royal Society of Queetisland , 2oth November, 



1918. 



Contents. 



Introducton^ 



Effects due to ticks 



Tick fevor 



Tick worry 



Habituation to ticks 



Tick poison 



Tick resist anc! 



Information re tick-resisting cattle 



Effect of breed on resistance 



Effect of food 



Effect of locality 



Effect of arsenic 



Persistence of resistance 



Transmissibility of resistance 



Eertility of ticks from resistant animals 



'■ Exudate " and " Tick sore ' 



Summary 



Literature 



PAGE 



219 

 220 

 221 

 226 

 227 

 228 

 234 

 242 

 278 

 281 

 284 

 285 

 288 

 291 

 303 

 306 

 313 

 315 



Introductory. 

 For about a quarter of a century Queensland has had 

 to suffer from the presence of the cattle tick, variously 

 tnown in Australian literature as Boo23hilus australis, 

 Rhipicephalus australis, Margarojjus atistralis, and as a 

 variety australis or microplus of Boophilus annulatus. In 

 this paper we intend to use the name Boophilus australis 

 Fuller. A constant feature readity distinguishing B 



*The Council of the Royal Society of Queensland desires to acknow- 

 ledge the financial assistance rendered towards the publication of this 

 paper by the University of Queensland from the Walter and Ehza Hall 

 [Fellowship fund. 



