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. 



is 

 o 

 O 



O 



o 



CO 



1 



is 

 o 

 o 



is 



o 

 O 



o 



is 



o 

 O 



o 

 O 



/ 

 s 







o 

 1 



3 



7 

 3 







3 



6 



8 







31 



— 



is 

 o 

 O 



o 

 c* 



is 

 o 

 O 



"3 

 "o 

 Eh 



1913. 



June 26 to July 1 



Julv 2 to July 9 



July 10 to July 19 



July 20 to July 29.... 



July 30 to Aug. 8 



Aug. 19 to Aug. 28 



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. 



1 

 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 



5 

 170 



370 

 670 



699 



300 



980 



107 

 819 



2,506 

 4,335 



3,726 



1,672 



5.167 



Aug. 29 to Sept. 5 



do 



230 6,467 25,393 







' 



i 



Total 



7,275 



4,725 



21.". 



14,4502.900 



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 11 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. 



