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DOI: 10.1055/s-2003-41626
Pancreatic Hormonal and Metabolic Responses in Overfed Ducks
Publication History
Received 25 October 2002
Accepted after Revision 4 February 2003
Publication Date:
21 August 2003 (online)
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Abstract
When overfed at their maximum (intensive overfeeding) or at only 80 % (moderate overfeeding) of food intake capacity, Mule ducks developed strong liver steatosis, whereas Pekin ducks showed very marked extrahepatic fattening. During overfeeding, evolution of plasma glucose and triacylglycerol concentrations suggested a very strong increase in the hepatic lipogenesis as well as genotype- and diet-independent lipoprotein secretion. In contrast, lipoprotein-lipase activity was dependent on alimentary status (the intensive overfeeding induces the highest activities), and Pekin ducks showed higher lipoprotein-lipase activity than Mule ducks, which could favor extrahepatic fattening to the detriment of hepatic steatosis. In Pekin ducks, plasma pancreatic hormone concentrations are related to diet levels and blood sugar. With similar food intake, Mule ducks (moderately overfed) showed global blood insulin lower than that of Pekin ducks (intensively overfed) despite similar blood sugar levels, suggesting a trend towards reduced pancreas response to glucose in Mule ducks. This may result from their lower lipoprotein-lipase activity as previously shown in these two ducks overfed at only 60 % of their maximal food intake capacity (unpublished results). These results suggest that high plasma insulin concentrations may be necessary to induce an optimum lipoprotein-lipase activity in overfed ducks.
Key words
Duck - Overfeeding - Fatty liver - Pancreatic hormones
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R. Hoo-Paris
Laboratoire de Nutrition et Biologie Appliquée · IUT de Mont de Marsan
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Email: robert.hoo-paris@univ-pau.fr