Untreated heifers (n = 2)

Mosquito survival (days)

> 4* (n = 46)

4 (n = 54)

> 4* (n = 75)

> 4* (n = 48)

> 4* (n = 151)

Fiproniltreated heifers (n = 3)

Mosquito survival (days)

> 4* (n = 74)

1 (n = 73)

1 (n = 115)

1 (n = 72)

> 4* (n = 213)

Statistical significance**

–

χ^{2} = 96.8; p < 0.0001

χ^{2} = 150.7; p < 0.0001

χ^{2} = 23.7; p < 0.0001

χ^{2} = 19.6; p < 0.0001

Ivermectintreated heifer (n = 1)

Mosquito survival (days)

> 4 (n = 18)

3 (n = 12)

4 (n = 23)

2 (n = 17)

> 4* (n = 82)

Statistical significance**

–

χ^{2} = 4.2; p = 0.04

χ^{2} = 27.1; p < 0.0001

χ^{2} = 11.7; p = 0.0006

χ^{2} = 0.08; p = 0.78
