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Table 4 The proportion of each developmental stage of life-cycle for D. gallinae in the rearing system under the two photoperiods (Mean ± SD)

From: Darkness increases the population growth rate of the poultry red mite Dermanyssus gallinae

Dpc

12:12 h L:D

1:23 h L:D

Eggs

Larvae

Protonymphs

Deutonymphs

Adults

Eggs

Larvae

Protonymphs

Deutonymphs

Adults

1

100

0

0

0

0

100

0

0

0

0

2

0

23.20 ± 8.60

76.80 ± 8.60

0

0

0

17.87 ± 3.40

82.13 ± 3.40

0

0

3

0

0

100

0

0

0

0

100

0

0

4

0

0

100

0

0

0

0

100

0

0

5

0

0

100

0

0

0

0

100

0

0

6

0

0

10.87 ± 6.59

89.13 ± 6.59

0

0

0

75.67 ± 18.54

24.33 ± 18.54

0

7

0

0

6.90 ± 4.37

93.10 ± 4.37

0

0

0

52.80 ± 26.17

47.20 ± 26.17

0

8

0

0

2.20 ± 2.25

93.73 ± 1.10

4.07 ± 1.22

0

0

23.73 ± 10.23

73.87 ± 8.36

2.40 ± 2.61

9

0.83 ± 0.06

0

0

78.60 ± 3.82

20.57 ± 3.87

2.70 ± 4.68

0

3.20 ± 3.87

77.47 ± 6.87

16.63 ± 3.40

10

3.33 ± 0.96

0

0

51.37 ± 9.50

45.30 ± 8.55

7.83 ± 3.51

0

0

58.53 ± 10.02

33.63 ± 10.75

  1. Notes: The complete life-cycle of D. gallinae, from the egg to a new egg generation, was carried out using the in vivo feeding system. The initial cohort size was 300 eggs. The observations took place every 24 h for 10 days. At each observation, the number of mites at different stages was counted under a stereomicroscope and the rate of mites at different stages was calculated every day. Observations were continued until the mites had reached the adult stage and laid the first egg