618 
Journal of Agricultural Research 
Vol. XXVIII, No. 7 
Table III .—Results of vaccine treatment in a Bacterium abortus infected dairy 
herd 
VACCINATED ANIMALS 
First period of gestation 
Second period of gestation 
Origi¬ 
nal 
No. 
Sold 
or 
died 
Con¬ 
ceived 
Sterile 
Pro¬ 
duced 
living 
calves 
Aborted 
Sold or 
died 
subse¬ 
quently 
to first 
preg¬ 
nancy 
Calved 
or 
aborted 
a 
second 
time 
Pro¬ 
duced 
living 
calves 
Aborted 
Num¬ 
ber of 
ani¬ 
mals 
with 
incom¬ 
plete 
record 
of 
second 
gesta¬ 
tion 
period a 
No. 
Per 
cent 
No. 
Per 
cent 
No. 
Per 
cent 
No. 
Per 
cent 
No. 
Per 
cent 
No. 
Per 
cent 
772. 
91 
617 
90.6 
64 
9.4 
536 
86.9 
81 
13.1 
128 
311 
279 
89.7 
32 
10.3 
178 
CONTROLS 
46 
294 
91.0 
29 
9.0 
242 
82. 3 | 52 
17.7 
63 
142 
122 
85.9 
20 
a Circumstances necessitated the discontinuance of this experiment before second gestation periods of a 
considerable number of animals terminated. 
Table IV .—Grouping of animals shown in Table III with regard to their aggluti¬ 
nation reactions 
HEIFERS WHICH GAVE NEGATIVE AGGLUTINATION REACTIONS JUST PRIOR TO 
VACCINATION 
First period of gestation Second period of gestation 
Origi¬ 
nal 
No. 
Sold 
or 
died 
Con¬ 
ceived 
Sterile 
Pro¬ 
duced 
living 
calves 
Aborted 
; 
Sold or 
died 
subse¬ 
quently 
to first 
preg¬ 
nancy 
| 
Calved 
or 
aborted 
a 
second 
time 
Pro¬ 
duced 
living 
calves 
Aborted 
Num¬ 
ber of 
ani¬ 
mals 
with 
incom¬ 
plete 
record 
of 
second 
gesta¬ 
tion 
period « 
No. 
Per 
cent 
No. 
[ 
Per 
cent 
No. 
Per 
cent 
No. 
Per 
cent 
No. 
Per 
cent 
No. 
Per 
cent 
266_ 
23 
229 
94.2 
14 
5.8 
211 
92.1 
18 
7.9 
53 
86 
76 
88.4 
10 
11.6 
90 
HEIFERS WHICH GAVE NEGATIVE AGGLUTINATION REACTIONS JUST PRIOR TO 
USE AS CONTROLS 
130. 
17 
110 
| 97.3 
| 3 
1 2 - 7 
95 
86.4 
15 
13.6 
27 
39 
32 
82.0 
7 
18.0 
44 
COWS WHICH GAVE NEGATIVE AGGLUTINATION 
VACCINATION 
REACTIONS JUST 
PRIOR TO 
292_ 
42 
234 
93.6 
16 
6.4 
210 
! 89.7 
f 
24 
10.3 1 
50 
144 
131 
91.0 
13 
9.0 
40 
COWS WHICH GAVE NEGATIVE 
AGGLUTINATION REACTIONS JUST PRIOR TO USE 
AS CONTROLS 
128_ 
23 
97 
92.4 
8 
7.6 | 
\ 
84 
86.6 ! 
13 ! 
i 
13.4 | 
17 
60 
55 
91.7 
5 
8.3 
20 
COWS AND HEIFERS WHICH GAVE POSITIVE OR ATYPICAL AGGLUTINATION 
REACTIONS JUST PRIOR TO VACCINATION 
214_ 
26 
154 
82.0 
34 
18.0 
115 74.7 
39 
25.3 
25 
' 81 
72 
88.9 
9 
11.1 
48 
COWS AND nEIFERS WHICH GAVE POSITIVE OR ATYPICAL AGGLUTINATION 
REACTIONS JUST PRIOR TO USE AS CONTROLS 
111_ 
6 
87 
82.9 
18 
17.1 
63 ! 72. 4 
I 
24 
27.6 
19 
43 
35 
81.4 
8 
18.6 
[ 25 
a Circumstances necessitated the discontinuance of this experiment before second gestation periods of a 
considerable number of animals terminated. 
