EFFECT OF CATTLE TICK ON MILK PRODUCTION. 
Table 1. — Source of seed ticks placed on cows and number of ticks picked from each cow 
at stated periods. 
Source of seed ticks placed on 
the cows. 
Number of ticks picked from— 
Period. 
1 
o 
e4 
o 
O 
CO 
o 
O 
o 
O 
o 
O 
CO 
1 
i - 
i 
c 
O 
1 
3 
7 
3 

3 
6 
8 
31 
33 
is 
o 
o 
o 
"3 
o 
Eh 
1913. 
June 26 to Jul v 1 
July 2 to July 9 
July 10 to July 10 
July 20 to July 29 
July 30 to Aug. 8 
Aug. 9 to Aug. 18 
Aug. 19 to Aug. 28.... 
Aug. 29 to Sept. 5 
Florida, except Anthony 
Anthony (few) and other 
places. 
Anthony and other Florida . . 
Anthony (most) and other 
places. 
Anthony (few) and other 
places. 
Florida (except Anthony) and 
"Washington, D.C. 
l 
2 

2 

6 
7 
8 
26 
14 
181 
728 
1,106 
355 
93 
906 
3,892 
16 
63 
187 
414 
451 
119 
872 
2, 603 
3 
6 
40 
53 
16 
16 
66 
45 
44 
256 
707 
1,475 
1,843 
825 
1,184 
8,116 
15 
49 
217 
252 
223 
158 
392 
1,594 
6 
35 
104 
129 
85 
84 
615 
2, 430 
2 
54 
146 
231 
54 
68 
139 
230 
5 
170 
370 
670 
699 
300 
980 
107 
819 
2,506 
4,335 
3,726 
1,672 
5 167 
do.*. 
6,46725,393 
Total 
7,275 
4,725 
245 
14,450 
2,900 
3,488 
924 
9,66143.725 
Note.— No ticks were picked after Sept. 5, as there was then a sufficient supply of mature ticks on hand 
from which to procure seed ticks for the remainder of the experimental period. 
The infestation from August 20 to October 7 was unusually large 
in those animals which were susceptible to the ticks; in others the 
infestation was only slight, as throughout the experiment. It may 
be said, however, concerning the infestation generally that the 
table does not present a complete picture to the eye, nor do photo- 
graphs taken on various dates. In the weekly infestation there were 
three or four broods on the cows at the same time, viz, newly attached 
seed ticks, week-old, two-weeks old, and, depending on the exact date, 
maturing ticks. In alternate-day infestation there were 1 1 broods on 
at once. On cows which favored their development one could feel 
by touch the young ticks that were covered by hair. From the 
beginning difficulty was experienced in gaging the number of young 
ticks that should have been put on the cows. In the weekly infesta- 
tion all the available ticks were used. The effects would not have 
been different had the same numbers been applied at intervals 
throughout the week. The infestation would have been less visible, 
however. 
Effort was made to apply about the same number each time, 
but later application gave better results than earlier ones. While 
the number placed on the animals was purely a matter of judgment, 
it is probable that the numbers applied from day to day did not vary 
so much as did the vigor with which the ticks attached themselves 
to the cattle. After the seed ticks were applied no changes could 
be made and results alone proved the numbers that remained on 
the cattle. 
