Fig. 4
Comparison of mass in gizzard, small intestine, rectum and gastrointestinal tract (a), the relationship between small intestine and gross energy intake (b), and the relationship between small intestine and digestible energy intake (c) among Red-billed Leiothrixs (Leiothrix lutea) acclimated to different temperatures for 4 weeks. Data are shown as mean ± SEM, and bars with different letters indicate significant differences. GEI gross energy intake, DEI digestible energy intake