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Effects of Clofibrate Treatment in Laying Hens

Institute of Agricultural and Nutritional Sciences, Martin-Luther-University Halle-Wittenberg, D-06108 Halle (Saale), Germany

¹ Corresponding author: klaus.eder{at}landw.uni-halle.de

Expression of peroxisome proliferator-activated receptor- (PPAR) has been shown in liver of chicks, but effects of its activation have not yet been investigated. In this study, laying hens were treated with clofibrate, a synthetic PPAR agonist, to investigate the effects of PPAR activation on liver lipid metabolism. Hens receiving a diet containing 5 g of clofibrate/kg had a lower food intake and higher liver mRNA concentrations of typical PPAR target genes (carnitine palmitoyltransferase 1A, acyl-coenzyme A oxidase, bifunctional enzyme, lipoprotein lipase) involved in hepatic mitochondrial and peroxisomal ß-oxidation and plasma triglyceride clearance than control hens that received the same diet without clofibrate (P < 0.05). Hens treated with clofibrate also had lower mRNA concentrations of fatty acid synthase, 3-hydroxy-3-methylglutaryl-coenzyme A reductase, and low-density lipoprotein receptor, proteins involved in fatty acid biosynthesis and cholesterol biosynthesis and uptake, than hens fed the control diet (P < 0.05). These changes in clofibrate-treated hens were accompanied by reduced liver triglyceride concentrations, strongly diminished very low density triglyceride and cholesterol concentrations (P < 0.05), a disturbed maturation of egg follicles, a complete stop of egg production, and a markedly reduced plasma 17-ß-estradiol concentration (P < 0.05). In conclusion, it is shown that clofibrate has complex effects on hepatic lipid metabolism in laying hens that mimic PPAR activation in mammals, affect maturation of egg follicles, and lead to a stop of egg production. Because clofibrate treatment strongly reduced food intake in the hens, some of these effects (i.e., egg production) may have been due to a low energy and nutrient intake.

Key Words: peroxisome proliferator-activated receptor- • clofibrate • laying hen • triglyceride • cholesterol

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