302 A TICK-RESISTANT CONDITION IN CATTLE. 



Those ten heifers togrether with a number of the sub- 

 jects of previous experiments (including Clover) were run 

 on an isolated paddock of about 30 acres, leased for this^ 

 purpose, whereon no stock had been running for a consider- 

 able time and which was practically surrounded by stand- 

 icg sub-tropicc^l scrub and at some distance from any 

 public road. After some nin9 months these heifers were 

 brought home and closely watched. 



Rosult : — One subject. Rosewood, died during the 

 following winter, cause not known. One sabject, Misery 

 (so named from its persistently poor condition) matiired 

 innumerable ticks, and is in this condition to-day (Feb., 

 1916), after dropping her second calf. 



The balance re-acted similarly to subjects of previous 

 experiments, shoAving at variable periods during the summer 

 months the clean ssrous exudate on escutcheon, with 

 occasional fully-engorged females present, but retaining 

 full immunity as regards iiecessity for any special treatment 

 against cattle-tick. 



Of these subjects seven are alive to-day (Feb., 1916)' 

 on this property, viz. Kittiwake, Seagull, Peewee, Cuckoo, 

 Stormbird, Beauty, Misery ; the two cows Starling and 

 Mulga succumbed under drought conditions obtaining 

 at the end of 1015. All living subjects have dropped their 

 second calves. 



Of the progeny of these there are extant Starling's 

 heifer, Dot ; Stormbird's bull, Trampas II., all other having^ 

 been destroyed or died throiigh stress of drought conditions, 

 last year (1915). 



V. Vaccinated by glycerinated virus from tick sores 

 on Tinkerbell into two calves at " Lonehand," the property 

 of Mr. Fred Hull. 



Result : — One sixbject extant to-day as a fully-matured 

 cow, on third calf, showing similar conditions as regards 

 resistance. 



VI. Contact experiment. Two calves. Brownie (dam,. 

 Spot, a very ticky, aged cow) and Wallum (dam, Heather- 

 bell, out of Clover) were enclosed in company from birth 

 until nine months old without contact with other calves or 



