260 A TICK-RKSISTANT ( ONDITION IN C^ATTLE. 



in fresh condition on 9th February, 1918. In March. 1918, 

 -three examinations were made and several (2-5) matured 

 females were removed on each occasion, while immature 

 ticks, males and unbJoated females were numerous on 

 ■escutcheon, neck and ears. The escutcheon was 

 -encrusted with yello"tt-ish scales. On June 7th, 1918, she 

 was again examined and a fcAv ticks^ — mostly small, i.e., 

 immature — were present. The yellowish scales were again 

 present on the esciitcheon. 



Nigger, born Octoltcr, 1916 : dam, Peewee. A black 

 Jersey heifer. This heifer remained free from tick infest- 

 ation throughout the January-February examinations. In 

 March, 1918, she Avas noted as "'fairly clean," carrying 

 .a light infestation of small ticks. 



Sunrise, born August, 191B ; dam. Sunset. A golden 

 y^ellow Jersey lieifer. This animal remained fairh* free 

 from ticks during the January- Febiuary examinations, 

 ■only occasional mature females being removed from her. 

 In March, 1918, she was still comparatively tick free. Sold, 

 1918. 



Vixen, born July, 1916 ; dam. Fairy. A Jersey 

 lieifer. Tliis animal was one of the tickiest under obser- 

 vation. Ten detailed examinations were made from January 

 17th-Febiuary lOtli, 1918, and on each occasion males, 

 half-bloated females and nymphs were abundant, especially 

 on escutcheon, skirt and neck, whilst matured females 

 were removed on each occasion, 26 being the greatest 

 number found at one time. In March, 1918, Vixen was 

 examined several times and 53 matured females were 

 removed on 18th March, 1918. She calved a fcAv days 

 afterwards. Immature ticks and unbloated females were 

 Very numerous. On Jinie 7th, matured ticks were less 

 abundant, only a few fully-matured females being found 

 though small ticks were present in fairly large numbers. 

 It is thought that this heifer is becoming resistant as the 

 proportion of fully developed ticks to the sickly j-ellow 

 infertile variety is diminishing. 



Donkey III, born December, 1916; dam. Donkey 

 II. A brindle steer, in poor condition. Remained ticky 



