264 A TICK-KESrSTANT CONDITION IN CATTLE. 



Of the two Ijranded R.O.S. one remained consistently 

 freer fr<jni ticks than tJie other. On one occasion (February 

 ^th), 2() fiUly- matured females were removed from the 

 escutcheon alone of the hitter, while many more coidd l)e 

 seen along the ])elly, sides of body and neck. Fully- 

 matured ticks were occasionally seeii on the oth»r heifer 

 (R.O.S. Xo. 2) but never in any great number. Thre& 

 exaininations were made from March 18th-25th, when both 

 heifers were carrying more ticks but in the same ratio as 

 before. Thirty-seven fully-matured females were i-emoved 

 from R.O.S. No. 1 on 22nd. while the shoidders, escutcheon 

 and dewlap were fairly encrusted with small ticks. The 

 escutcheon of this heifer was covered with yellowish white 

 scabs, while the butt of the tail was scurfy. R.O.S. No. 2 — 

 the relatively clean animal — -was also carrying numerous 

 small ticks and yellowish white sca))s on the escutcheon 

 but the latter were not as i)Ientifid as on lier mate. June 

 7th : Both these heifers Avere carrying ticks, the one being 

 more heavily infested just as on former occasions. In 

 both, the escutcheon was coated witli the whitish scabs 

 mentioned above. 



J.4.V. This — tlie odd — heifer soon ])ecame very tame- 

 and could l)e examined with ease. She remained practically 

 free from ticks during the January-Fe1)ruary examinations. 

 On February Dth, about six tin}' s])ots of yellow exudate 

 appeared on the escutcheon. March lSth-2oth : Carried 

 many more ticks than on ])re\'ious examinations. The 

 escutcheon was quite covered with small immature ticks 

 while about 12 mature fenuiles were removed on one occasion 

 and 5 on another. Dry yellow granides were apparent 

 on escutcheon. The ticks were practically confined to this 

 jiortion, the rest of the body l)eing almost free. June 7tlv : 

 a few immature ticks visible. 



Prior to trucking on Jun(^ 17th, all these heifers were 

 hand-picked and spraj'ed to comply with Stock regidations, 

 though ticks were not numerous on them. In response 

 to our request as to their condition, the owner, Mr. A. W. 

 Johnston, stated (October, 1918) that one of the heifers— 

 R.O.S. No. 1 — had a few ticks on arrival at Rosewood and was 

 still shewing some, though she had been dipped. None 

 of the others appeared to have ticks Jior were any of the- 



