Fig. 2

Biplot of principal component analysis. PCA was performed on the data of the 16 DEGs for the diet effect. The male ducklings from the R group (MR) and the C group (MC) are represented in red crosses and grey squares, respectively and the females from the R group (FR) and the C group (FC) are in yellow triangles and blue circles, respectively. The ellipses to gather the groups were added. The two first principal components explain 53.7 and 15.1% of the whole variability, respectively. The correlation circle showed correlations between the DEGs and the two main principal components and displayed an opposite regulation pattern between the 9 down-regulated genes (on the right side of the figure) and the 7 up-regulated ones (on the left side of the figure), when compared the R group to the C group samples