384 



MILK AND DISEASE 



(e) "If the reaction is detected prior to the sixteenth hour the 

 measurements should be continued until the expiration of this 

 period. 



(/) "If there is an unusual change of temperature of the stable 

 or a sudden change in the weather, this fact should be recorded on 

 the report blank. 



(g) "If a cow is in a febrile condition tuberculin should not be 

 used, because it would be impossible to determine whether, if a rise 

 in temperature occurred, it was due to the tuberculin or to some 

 transitory illness. 



(A) "Cows should not be tested within a few days after or before 

 calving, for experience has shown that the results at this time may 

 be misleading. 



FIG. 45. Straus's home pasteurizer. (From Rosenau's Preventative Medicine.) 



(i) "The tuberculin test is not recommended for calves under 

 three months old. 



( j) " In old, emaciated animals and in retests use twice the usual 

 dose, for these animals are less sensitive. 



(fc) " Condemned cattle must be removed from the herd and kept 

 away from those that are healthy. 



1. "In making postmortems the carcasses should be thoroughly 

 inspected and all the organs should be examined. 



"No animal w T hose temperature exceeds 39.5 (\ (103 F.) is a 

 fit subject for the tuberculin test. 



"A rise of temperature to above 40 C. (104 F.) in any animal 



