Table 2.
Explained variable | Hz index used | A*H*R | AIC | A*H in A-chicks | A*H in B-chicks |
Body weight | H | <0.0001 | 3267.5 | 0.68 | <0.0001 |
SH | <0.0001 | 3271.7 | 0.44 | <0.0001 | |
IR | <0.0001 | 3273.3 | 0.86 | <0.0001 | |
H' | 0.020 | 3284.8 | 0.12 | 0.0020 | |
SH' | 0.046 | 3285.9 | 0.094 | 0.0038 | |
IR' | 0.064 | 3289.2 | 0.12 | 0.0055 | |
Wing length | H | <0.0001 | 2612.3 | 0.58 | <0.0001 |
SH | 0.0001 | 2615.0 | 0.91 | <0.0001 | |
IR | <0.0001 | 2615.4 | 0.39 | <0.0001 | |
H' | 0.013 | 2621.7 | 0.31 | 0.0007 | |
SH' | 0.037 | 2621.6 | 0.15 | 0.0013 | |
IR' | 0.038 | 2626.8 | 0.41 | 0.0033 | |
Tarsus length | H | 0.0017 | 2758.8 | 0.71 | 0.0025 |
IR | 0.0013 | 2760.4 | 0.95 | 0.011 | |
SH | 0.012 | 2762.2 | 0.28 | 0.0045 | |
H' | 0.027 | 2765.2 | 0.75 | 0.04 | |
IR' | 0.014 | 2767.2 | 0.20 | 0.054 | |
SH' | 0.089 | 2766.3 | 0.97 | 0.089 |
We used AIC for model selection. Parameters: A (Age), H (Heterozygosity, estimated by the index in the column "Hz index used") and R (hatching Rank, a binary effect). For heterozygosity indices: H, SH and IR are calculated over all loci, while H', SH' and IR' are calculated without OHW loci and K31. With either heterozygosity index, the structure of the selected model was: A+H+R+AH+HR+AHR+A2 plus the random effect of chick identity. Since the interaction A*H*R was significant, we also tested the significance of the A*H effect in each rank (A or B-chicks). P-values below 0.05 are in bold. (Note: a more complete version, with the mean effect size for heterozygosity for each analysis, is given as additional file 1).