250 A TICK-RESISTANT CONDITION IN CATTLE. 



Dawn, born August, 1910, dam, Sunbeam, — sire, 

 Peter Pan. A red Shorthorn- Jersey strain. 



( Vaccinated from " Marty,"' 13/12/13 ; sprayed, 

 December, 1915 : infested, January. 191G (condition low) ; 

 sprayed, January, 1916 ; patch of ticks on escutcheon, 

 March, 1916 (coiidition low) ; clean^ — no trace of ticks, 

 7/4/16 ; condition prime, slight exudate, 4/11/16 : condition 

 prime, no ticks, 9/1/17 ; condition prime, few mature 

 females, 19/3/17 ; February 10th, 1917, applied larvae 

 from ticks from " Sunset '"' ; February 19th, 1917, about 

 80 visible ; February 20th, 1917, only 10 maturing ticks by 

 natural infestation, excluding dead nymphs and males ; May 

 4th, 1917, vaccinated on neck and rump with serum from Isis 

 and Sprite ; Ma}" 30th, 1917, ticks not attacking escutcheon, 

 rest of body heavily infested and maturing in normal 

 quantities ; May 30th, 1917, vaccinated from ""Kittiwake " ; 

 June 6th, 1917, body heavily infested, escutcheon clean ; 

 June 18th, 1917, free from ticks; December 11th, 1917, 

 clean. Stock book). 



Examined by one of us (24/6/1916) immediately on 

 her return to Eumundi after several months' sojourn in 

 an ordinar}' ticky paddock, and found to be apparently 

 clean. Dawn had been running since December, 1917, 

 with a heifer calf in Martin's paddock which previously 

 carried ticky stock. Inspected 3rd February, 1918, only a 

 few nymphs could be found. Calf also clean. 



Dot, born October, 1914 ; dam. Starling ; a black 

 Jersey cow with fine short hair. (Slight exudate. October 

 and November, 1916. Stock book). 



June 24th, 1916 : Several small ticks seen, none 

 engorged. Examined twice daily from January 16th- 

 25th, 1918 : nymphs and males and half-bloated females 

 seen on all occasions while nine fully-matured females 

 were removed during that period. Fresh exudate appeared 

 on January 24th. 



Fairy, born September, 1911 ; dam, Vixen. A yellow 

 Jersey, a very ticky animal until last season (1917). 

 (Vaccinated from " Sweetbriar," 2/3/15 ; sptayed for last 

 time, February, 1916 ; extensive exudate observed, 14/11/16. 

 Stock book). 



