Table 1 Embryonic heart rates before and after 1 hour of cooling treatment.

From: Incubation temperature affects the expression of young precocial birds’ fear-related behaviours and neuroendocrine correlates

Group

Embryonic heart rate (Beats per minute)

ED 12

ED 13

ED 14

ED 15

before

after

before

after

before

after

before

after

Experimental eggs (n = 12)

246.04 ± 15.79

116.73 ± 11.29*

265.63 ± 12.36

106.75 ± 5.27*

271.87 ± 6.97

102.54 ± 3.88*

282.51 ± 9.89

111.48 ± 5.36*

Wilcoxon tests

z = −3.06 P = 0.002

z = −3.06 P = 0.002

z = −3.06 P = 0.002

z = −3.06 P = 0.002

Control eggs (n = 12)

257.58 ± 16.84

261.18 ± 20.34

257.0 ± 14.54

270.94 ± 11.73

279.18 ± 8.98

281.47 ± 9.58

281.13 ± 8.32

284.30 ± 8.96

Wilcoxon tests

z = −0.15 P = 0.85

z = −1.49 P = 0.14

z = −1.33 P = 0.18

z = −0.63 P = 0.53

  1. Mean beats per minute ± s.e.m. of experimental and control embryos on embryonic days (ED) 12, 13, 14 and 15 and Wilcoxon tests outcomes (intragroup comparisons). *P < 0.05.
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