Additional file 3 of Genetic architecture of backfat thickness in laying hens: implications for extended egg production

Additional file 3: Fig. S1. Plot of the mixture of Gaussian distributions of backfat thickness (BFT): histogram (in gray) Kernel density estimates (in black, red, blue and green; y-axis) of BFT (x-axis). The black line represents the Kernel density estimates under the hypothesis of a single underlying Gaussian distribution, whereas the red, blue and green lines represent the Kernel density estimates under the hypothesis of three underlying distributions. Simple tests suggesting the presence of a major gene segregating for a trait