Fig. 2

Cluster and PCA plot of transcriptome profiles. a Hierarchical cluster of transcriptomes. ID represents one sample from animal. For instance, “×4168_3_H” means the sample from animal No. ×4168 which was assigned to the third group (TRT12) and from primiparous heifers (H). b PCA plot of transcriptomes for the colon samples from TRT0_H (red color), TRT0_C (green color), TRT6_H (blue color), TRT6_C (yellow color), TRT12_H (grey color) and TRT12_C (brown color). The X and Y-axis represent the first two principle components. The percentage value in the bracket represents the percentage of variance explained by that principle component. c PCA plot of the immune-related genes