Heat stress (HS) stimulates adipogenesis in adipocytes. (A) oil red O staining of pig adipocytes on d 3, 6, and 9 of differentiation (40x) at 37 and 41.5°C temperatures. (B) Triglyceride (TAG) concentration was measured in pig adipocytes under normal conditions (37°C) and HS condition (41.5°C) on d 3, 6, and 9, respectively. Bars represent means ± SEM of at least 6 different replicates. *Mean difference between HS and control at P < 0.05.