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Table 1 Survival and feeding rates of D. gallinae with photoperiod of 1:23 h L:D

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

Variable

Photoperiod

Days post-challenge

7

14

21

28

Feeding rate (%)

1:23 h L:D

52.0 ± 7.0

36.7 ± 1.1

44.8 ± 5.9

50.5 ± 1.9

Survival rate (%)

1:23 h L:D

98.9 ± 0.6

98.9 ± 0.2

98.1 ± 0.1

98.6 ± 0.1

  1. Notes: Chicks were challenged with 220 D. gallinae at 0 dpc and kept on prolonged darkness photoperiod of 1:23 h L:D. The numbers of dead and fed D. gallinae were recorded at 7, 14, 21 and 28 dpc. Survival and feeding rates were calculated as follows: Survival rate (%) = Number of surviving mites/Total number × 100%; Feeding rate (%) = Number of feeding mites/Total number × 100%. All values are shown as mean ± SD from three independent experiments