Hormonal and metabolic responses to overfeeding in three genotypes of ducks.
Muscovy, Pekin and Mule duck are different in their body weight. To make a valid comparison in the lipid metabolism between these three genotypes, overfeeding was carried out by providing the animals with amounts of food in proportion to their body weight. Under these conditions, Muscovy ducks developed a strong liver steatosis, whereas it was not very pronounced in the Mule ducks and even less in the Pekin ducks. On the contrary, Pekin ducks showed a much marked extrahepatic fattening. At the beginning of overfeeding, there was a similarity in the three genotypes as regards the post-heparin lipoprotein-lipase (LPL) activity and the insulin and glucagon concentrations. After 10 days of overfeeding, the LPL activity dramatically fell in Muscovy and in Mule ducks, whereas it remained steady in Pekin ducks. Compared to values found at the beginning of the overfeeding period, plasma glucagon and insulin shown no evolution, except for the insulin of Pekin ducks which was dramatically higher. Those data suggest that high plasma insulin concentrations measured in Pekin ducks after 10 days of overfeeding can be responsible for the maintenance of the LPL activity, which favors the extrahepatic fattening to the detriment of liver steatosis.
Davail
Stéphane
S
Laboratoire de Nutrition et Biologie Appliquée, IUT des Pays de l'Adour, 4000 Mont de Marsan, France.
Rideau
Nicole
N
Guy
Gérard
G
André
Jean-Marc
JM
Hermier
Dominique
D
Hoo-Paris
Robert
R
D000818:Animals; D001786:Blood Glucose / Q000378:metabolism; D001835:Body Weight; D004372:Ducks / Q000378:metabolism / Q000502:physiology*; D005502:Food; D005838:Genotype; D005934:Glucagon / Q000097:blood; D007328:Insulin / Q000097:blood; D008071:Lipoprotein Lipase / Q000378:metabolism; D008297:Male; D009929:Organ Size; D013045:Species Specificity
D001786:Blood Glucose; D007328:Insulin; D005934:Glucagon; D008071:Lipoprotein Lipase