Acoustic parameter | Effect of hunger treatment a | Â | Variance components (in %) | ||||||
---|---|---|---|---|---|---|---|---|---|
 |  |  | Estimate | p-value |  | Hunger | ID | Nest | Residual |
 | Duration (ms) |  | -4.17 ± 1.23 | < 0.001 |  | 2.2 | 37.8 | 20.9 | 39.2 |
 | Amplitude (dB) | mean | 2.98 ± 0.26 | < 0.001 |  | 11.8 | 30.4 | 17.9 | 39.8 |
 | Amplitude modulation (1/ms) | variance | (-0.02 ± 0.08) x10-3 | 0.753 |  | 0.2 | 21.4 | 11.0 | 67.4 |
 | Frequency (Hz) | mean | -239.59 ± 36.87 | < 0.001 |  | 3.9 | 31.5 | 19.2 | 45.4 |
Part 1 | Frequency modulation | mean | 0.03 ± 0.34 | 0.926 |  | 0.4 | 43.7 | 20.9 | 35.0 |
 | Frequency modulation | variance | 12.57 ± 5.19 | 0.016 |  | 0.3 | 35.7 | 12.7 | 51.3 |
 | Entropy | (log) mean | 0.19 ± 0.03 | < 0.001 |  | 3.6 | 22.8 | 37.4 | 36.2 |
 | Entropy | variance | (-0.36 ± 10.85) x10-3 | 0.974 |  | 0.7 | 26.3 | 7.6 | 65.4 |
 | Pitch (Hz) | mean | -289.59 ± 44.52 | < 0.001 |  | 3.8 | 38.1 | 0.0 | 58.0 |
 | Pitch goodness | mean | 24.33 ± 3.24 | < 0.001 |  | 5.2 | 31.6 | 12.5 | 50.8 |
 | Duration (ms) |  | 15.85 ± 0.94 | < 0.001 |  | 18.5 | 50.9 | 4.6 | 26.0 |
 | Amplitude (dB) | mean | 4.58 ± 0.26 | < 0.001 |  | 24.2 | 28.8 | 17.7 | 29.4 |
 | Amplitude modulation (1/ms) | (log) variance | (-0.27 ± 0.06) x10-3 | < 0.001 |  | 2.3 | 9.5 | 7.4 | 80.7 |
 | Frequency (Hz) | mean | -32.08 ± 37.33 | 0.391 |  | 0.3 | 32.7 | 7.6 | 59.4 |
Part 2 | Frequency modulation | mean | 1.39 ± 0.32 | < 0.001 |  | 1.1 | 50.6 | 9.6 | 38.7 |
 | Frequency modulation | variance | 11.94 ± 6.00 | 0.047 |  | 0.6 | 18.5 | 9.2 | 71.7 |
 | Entropy | (log) mean | 0.26 ± 0.03 | < 0.001 |  | 6.2 | 26.6 | 21.2 | 46.0 |
 | Entropy | variance | (-1.43 ± 0.94) x10-2 | 0.128 |  | 0.0 | 31.6 | 1.4 | 66.9 |
 | Pitch (Hz) | mean | -135.20 ± 48.15 | 0.005 |  | 0.4 | 42.0 | 1.5 | 56.2 |
 | Pitch goodness | mean | 38.60 ± 3.82 | < 0.001 |  | 7.5 | 17.8 | 30.0 | 44.8 |