386 BOARD OF AGRICULTURE. [Pub. Doc. 



kept. In one instance a herd of five cows, kept especially to 

 furnish the children with a pure milk supply, all reacted, and 

 the post-mortem examination showed that they were tubercu- 

 lous. In a herd of sixty-four animals, carefully selected, and 

 kept under apparently the best conditions for a private milk 

 supply, sixty of the sixty-four reacted, all of Avhich were 

 killed, and the post-mortem examination confirmed the cor- 

 rectness of the diagnosis. 



In the examination of a herd of 23 animals 17 were condemned. 



Upon post-mortem examination all were found tuburculous. 



We have had numerous other instances where in large herds 

 of cattle the percentages have averaged from 100 per cent, 

 down. 



The following table, prepared by "Rockl," is of interest 

 in this connection : of 51,427 cattle slaughtered in 1888-89 in 

 abattoirs and butcher shops in Germany, the percentage of in- 

 fection according to age was as follows : up to six weeks old, 

 0.6 per cent. ; from six weeks to one year, 0.6 per cent. ; from 

 one year to three years, 11.4 per cent. ; from three years to 

 six years, 33.1 per cent. ; over six years, 43.4 per cent. 

 (Report of P. H. Brice, M.D., to the Provincial Board of 

 Health, Toronto, page 25.) 



