INFECTIOUS DISEASES OF ANIMALS. 
197 
The following table is taken from our Experiment Station 
Bulletin, No. 51, and is quite suggestive as to the influence 
concerning the prevalence of this disease among natives, high 
grades, pure breds, city dairies, and in the various conditions 
of stables : 
TABLE XEVIII.—PREVALENCE ACCORDING TO CLASS AND 
CONDITION. 
table summary:—greatest prevalence among “pure breds,” 
“CITY DAIRIES,” “POOR CONDITION OP STABLE ” AND “POOR VEN¬ 
TILATION.” FARM CONDITIONS, GOOD STABLES AND VENTILATION 
DO NOT PREVENT INFECTION, HOWEVER. 
CLASS. 
Number of 
herds 
tested. 
Number 
animals 
tested. 
Number 
re¬ 
actions. 
Per cent, 
tuber¬ 
culous. 
I 
Natives .. 
137 
2839 
223 
7.8 
2 
High Grades. 
5 
157 
17 
10.8 
3 
Pure breds. 
6 
258 
43 
16.6 
4 
Farm herds. 
38 
694 
99 
*14.2 (7.8) 
5 
City dairy herds. 
108 
2736 
284 
10.4 
6 
In “good” general condition 
of stable. 
57 
1370 
139 
*10.1 (6.8) 
7 
In “ fair ” condition of stables 
59 
II40 
83 
7.28 
8 
In “poor ” condition of stables 
32 
864 
165 
19.1 
9 
With “good ” ventilation . . 
45 
IOII 
99 
*9-8 (5) 
10 
With “ fair ” ventilation . . . 
45 
1087 
67 
6.16 
11 
With “ poor ” ventilation . . . 
48 
I2IO 
201 
16.6 
Note. —Fifty-five of these tuberculous animals in each case—(groups 4, 6 and *9) were from 
the same two herds. Eliminating these two herds from groups 4,6 and 9 the percentages are 
reduced respectively to 7.8, 6.8 and 5. 
This data was collected in the most impartial way that 
could be devised and with the sole view of investigation. This 
showing is what any student of sanitary matters should expect. 
1 
The mere fact that the percentage of tuberculosis is highest in 
pure bred herds should not suggest that men should not breed 
pure bred cattle. It only suggests that men should not estab¬ 
lish herds upon tuberculous foundations. They should breed 
healthy pure bred cattle, not tuberculous pure bred cattle. The 
figures here given should be taken as percentages for certain 
classes, and not as representing the entire cattle stock of Min¬ 
nesota. 
