“…30 Most of the intestinal hormones, including appetite inhibitors of CCK, ghrelin, PYY, and SS that are mainly released by intestinal epithelial cells, have a strong inhibition of appetite and can hamper intestinal movements. [31][32][33][34] Ghrelin, originally identified as a growth-hormone-releasing peptide released from the stomach of mammals, is an interesting hormone owing to its adverse function on appetite between mammals and poultry, which might be involved in inhibiting feed intake, particularly in young growing chickens. [35][36][37] The current results showed that heat exposure significantly elevated the intestinal hormone levels of SS, ghrelin, CCK and PYY in the duodenum, as well as SS and ghrelin in the jejunum for 35-day-old broilers, and increased the intestinal hormone levels of SS and PYY in the intestine, as well as ghrelin in the jejunum on day 42 compared with the NC and PF groups.…”