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Table 5 Fipronil sulfone concentrations in plasma (Cp) for individual white-tailed deer

From: Development of a low-dose fipronil deer feed: evaluation of efficacy against two medically important tick species parasitizing white-tailed deer (Odocoileus virginianus) under pen conditions

Test group

Sex

Body weight (kg)

Amount fipronil/body weight (mg/kg)

Days post-FDF exposure

Fipronil (ppb)

Fipronil sulfone (ppb)

Number of female ticks alive at day 8 after tick introduction

T48 (48-h FDF exposure)

Female

83.8

0.6

7

 < LOQ

16.8

1

Male

86.4

0.58

7

0.7

32.2

0

Female

72.2

0.32

7

0.5

6.3

6

Male

93.9

0.27

7

0.2

25.0

0

Male

77.9

0.27

21

 < LOQ

2.5

8

Female

82.4

0.24

21

 < LOQ

2.4

8

Male

50.4

0.99

21

 < LOQ

12.2

6

Female

72.1

0.34

21

 < LOQ

13.2

2

T120 (120-h FDF exposure)

Male

104

1.2

7

2.5

74.3

0

Female

81.8

1.24

7

0.9

89.7

0

Female

56.8

1.1

7

 < LOQ

37.7

0

Female

68.4

0.91

7

1.5

27.3

0

Female

66.3

0.93

21

 < LOQ

26.4

0

Female

62.7

0.94

21

 < LOQ

5.6

8

Female

50.9

1.47

21

 < LOQ

41.1

0

Female

84.1

0.44

21

 < LOQ

13.5

1

Control

Male

99.9

NA

7

ND

ND

32

Female

78.8

NA

7

ND

ND

14

Male

74.2

NA

7

ND

ND

26

Female

52.8

NA

7

ND

ND

34

Female

69.3

NA

21

ND

ND

10

Male

83.5

NA

21

ND

ND

11

Female

91.3

NA

21

ND

ND

17

Male

79.2

NA

21

ND

ND

25

  1. These data represent all deer fed FDF and untreated control deer (fed placebo), and the subsequent number of live female ticks (attached and detached I. scapularis and A. americanum) at the conclusion of the tick challenge on day 8 after tick introduction (n = 40 females per deer; 20 females for each species)
  2. LOQ Limit of detection, ND no fipronil detected