290 



A TICK-RESISTANT CONDITION IN CATTLE. 



be accounted for partly l^y old age and partly by extreme- 

 poverty of condition as reported to ns bj- Mr. Butcher, 



The rate of spreading of the resistant condition 

 amongst Mr, Hull's herd may be readily noted by consult- 

 ing the graph (p. 289). The drop in the percentage, 1909- 

 1911, is partly accounted for by the addition of a number 

 of non resistant animals to the herd. 



Temperature of Resistant Animals, 

 As regards the temperature of resistant animals tests 

 made during January and February, 1918, failed to shew 

 any abnormality. Of the temperatures per vaginam 

 recorded from thirteen resistant cows, most we re found to- 

 fall within the normal range of variation — i.e., between 

 100.8 and 101.6 degrees, the extremes obtained being 100.4 

 and 102.3* ; we thus agree with Pound's statement (1914, 

 p. Ill), based on his observations regarding Clover and 

 Tinkerbell. The temperature chart for a period of fifteen 

 days (January-February, 1918), for the cow Fairy is 

 appended.! We are of opinion that observations made 

 during winter would give similar results. 



/Ol 



NoriT^ " C 



Id' 



IOC 



18 2Cj. JO. H f Z. 5 If 5 b I g cf 10 II 



Temperature chart of cow Fair\'. 



*Dodd (1908, p. 11) mentions that a variation of several degrees in 

 temperature from the normal 101.5 may be met with in healthy young 

 cattle during our summer. 



jW. Osborne. Elements of Animal Physiologj% 1909, p. 64, gives- 

 101,5 — 102°F, as the normal temperatures of a cow (per rectum). 



