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Asian-Australas J Anim Sci > Volume 24(12); 2011 > Article
Poultry and Laboratory Animal Nutrition
Asian-Australasian Journal of Animal Sciences 2011;24(12): 1736-1743.
DOI: https://doi.org/10.5713/ajas.2011.11164    Published online October 24, 2011.
Effect of Corticosterone on Hypothalamic Corticotropin-releasing Hormone Expression in Broiler Chicks (Gallus gallus domesticus) Fed a High Energy Diet
Zhigang Song, Lei Yuan, Hongchao Jiao, Hai Lin
Abstract
This paper reports the peripheral and central effect of corticosterone on feed intake and hypothalamic corticotropin-releasing hormone (CRH) gene expression in chicks fed a high energy diet. Three experiments were conducted: corticosterone was supplemented to the feed (30 mg/kg diet), injected subcutaneously (s.c., 4 mg/kg body weight) or intracerebroventricularly (i.c.v., 4 ng). The results showed that dietary corticosterone significantly increased feed intake. The s.c. corticosterone administration increased feed intake within 1 to 3 h and at 1 to 5 h after the injection. The i.c.v. corticosterone administration increased feed intake within 1 h after the injection, but not at 1 to 3 h. Dietary supplementation and s.c. injection of corticosterone decreased the CRH gene expression in the hypothalamus. Therefore, peripheral corticosterone exerted a decreased effect on hypothalamic CRH mRNA levels, and corticosterone had a stimulating effect on feed intake in broiler chicks fed a high energy diet.
Keywords: Broiler Chicks; Corticosterone; Corticotropin-releasing Hormone; Feed Intake
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