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Effect of heat stress on gene expression of ghrelin and cholecystokinin (CCK) in laying hens' gastrointestinal tract. (a) Glandular stomach, (b) Duodenum, (c) Jejunum, and (d) Ileum. Values indicate mean ± SE (n = 6). a, bMeans with different superscripts are significantly different (P < 0.05).
