Feb., lUlSj 



Cattle Tcmpcranioit 



i;u 



dem Brustkorb and die Zwcrclifellathmung beim Ausdruck der 

 Gefuhlc zcigcn. Ueberall, wo in unsern Versuchen der Athem 

 charackteristische Veranderungen aufweist, finden sich analoge 

 Erscheinungen im Puis." (12). 



It can be shown by suitable curves recorded while the 

 animal is resting, that there is a fundamental rhythm in the 

 respiratory movements, which is peculiar to each individual. 

 Ordinarily this rhythm is obscured because external and 

 internal stimuli affect respiration to a very large extent. It 

 has been our experience, that those animals which were least 



Fig. 1. Respiration tracings of 7H (above) and 2H (below) recorded while 

 feeding. At A, B and C are shown the deep expirations. This type of 

 respiration recalls the Cheyne-Stokes breathing sometimes seen in man, 

 and is typical of resting animals or those which have a stolid disposition. 

 The contrast between these tracings illustrates very well the difference 

 between the respiration of a stolid and nervous cow. Time intervals, 

 five seconds. 



nervous and most easily handled, showed this fundamental 

 rhythm very often ; and further, that the fundamental rhythm 

 of these very stolid animals showed a very low variability when 

 compared with rhythms of more nervous ones, (see Figure 1). 

 As a result of considerable preliminary work and experience 

 with animals concerned, we have confined this study to the 

 measurement of the variability of the depth of breathing, shown 

 by four Holstein cows, which were tested as nearly as possible 

 under the same normal stable conditions. 



