Annual report of the director of animal industry for the year ending November 30, 1920-[1934] . the dis-ease, but rather that the amended law and the increasingpopularity of the tuberculin test operate to bring more casesto our attention for disposal. We feel that we can in conse-quence more correctly estimate actual existing conditions ofprevalence of this disease than was formerly possible. Following is a chart showing for a period of nineteen yearsthe number of cases reported to this Division and the numberactually found diseased as proved by post-mortem examina-tion, with marginal notes st
Annual report of the director of animal industry for the year ending November 30, 1920-[1934] . the dis-ease, but rather that the amended law and the increasingpopularity of the tuberculin test operate to bring more casesto our attention for disposal. We feel that we can in conse-quence more correctly estimate actual existing conditions ofprevalence of this disease than was formerly possible. Following is a chart showing for a period of nineteen yearsthe number of cases reported to this Division and the numberactually found diseased as proved by post-mortem examina-tion, with marginal notes stating the methods of disposal. This years tabulation, as shown in the opposite chart, prob-ably more nearly approaches a correct record of the prevalenceof tuberculosis in our herds than that of any other one addition to a diligent search for clinical cases as formerly,and the bringing to our attention of many more cases by theoperation of the amended law increasing the indemnity payableby the Commonwealth, the tuberculin test reactors appear this 1921. PUBLIC DOCUMENT —No. 98. 11. 12 ANIMAL INDUSTRY. [Jan. year as a greater factor than ever before in our statistics, con-stituting a much larger portion of the total number of animalskilled. Comparing the last three years records, we find the per-centage of reactors to total number killed, as follows: 1918, per cent; 1919, per cent; 1920, per cent. Inother words, one-third of all the tuberculous cattle killed underour supervision this year were reactors to a tuberculin test andkilled for that reason. Practically none of these cases couldhave been detected by physical examination. Following are various tables showing the extent of the workof the Division in connection with the control of bovine tu-berculosis in Massachusetts for the year ending Nov. 30,1920: — Massachusetts reported as diseased in 1919 disposed of in 1920, . 33 Cattle reported as diseased during the year, . . 2,069 2,102 Dis
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