BY T. HARVEY JOHNSTON AND M. J. BANCROFT. 275 



did not know how the peculiarity began ; but from those 

 two by vaccination into scratches and horn injiiries on the 

 ticky animals he increased the number of resistant animals 

 to eight in 12 months. He had noticed that when cows 

 became low in condition the resistance was greatly 

 decreased. His resistant stock were all of mixed breed and 

 various colours, some sleek-coated and some long-haired. 



A resistant cow was sold ])y Mr. Cross to Mrs. iSonders^ 

 Sherwood. This animal was examined on May 16th, 1918^ 

 and was found to bo a black Jerse}^ of shiny sleek aj)pear- 

 auce. Mrs. Bonders had noticed a few full-blown ticks 

 on the escutcheon a few days previously and rubbed that 

 part over with grease and arsenic. The cow was then quite 

 clean and shewed no trace of exudate. She had calved a 

 week previously, which ma}' liavo accounted for her 

 temporarily lowered resistance. 



In response to our request for information asked for 

 per medium of the daily and country press of Queensland,^ 

 a letter appeared in the "'Queensland Grazier" 31st May,. 

 1918, signed by W. G. Gray of Junggury, Ravenshoe (about 

 20 miles from Herberton and at an elevation of about 

 3,000 feet) in which the writer stated that he had in his 

 possession three tick-resistant animals- — a cow and her two 

 calves. This cow is a Hoi stein- Shorthorn crossbred, 

 purchased when 10 months old and from that time has 

 carried very few ticks. A steer by a ticky shorthorn sire 

 and a heifer bj^ a Jersey sire had remained tick-free from 

 birth and had never been dipped though running with ticky 

 stock. Exudate had not been noticed. 



A letter dated May 14th, 1918, was received from Mr. 

 C. A. Ware, of Springdale, Bracewell, Mt. Larcom. Mr. 

 Ware stated that he had a Jersey cow and progeny that 

 had not required treatment for ticks for the last three j-ears 

 although running with several hundred head of ordinary 

 ticky stock. The writer mentioned that his brother also> 

 had a Jersej' cow and progeny that were tick resistant. 

 Both the original cows were purchased from the same herd 

 in the Isis district. Of four calves from the resistant cow 

 two bj^ Jersey bulls were just as clean as the mother while 

 two by Hereford bulls carried ticks, but not to the same 

 degree as the other cattle. 



