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Journal of Dairy Science Vol. 77 No. 7 1870-1881
© 1994 by American Dairy Science Association ®
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Lipoprotein Metabolism in the Preruminant Calf: Effect of a High Fat Diet Supplemented with L-Methionine

Silvy Auboiron 1, Denys Durand 1, Dominique Bauchart 1, Jean-Claude Robert 2, and M. John Chapman 3

1 Unité de Recherches Métabolismes Energétique et Lipidique, Laboratoire Croissance et Métabolismes des Herbivores, Institut National de la Recherche Agronomique, Centre de Recherches Clermont-Ferrand-Theix, 63122 St Genès-Champanelle, France
2 Rhône-Poulenc Nutrition Animale, 03600 Commentry, France
3 Unité de Recherche sur les Lipoprotéines et l'Athérogénèse, U321, Institut National de la Santé et de la Recherche Médicale, Hôpital de la Pitié, 75651 Paris Cedex, France

The effects of dietary lipid and L-Met supplementation on plasma lipids and lipoproteins were investigated in 16-wk-old preruminant calves. Four calves received the basal milk diet (2.0 g of lipid/kg of BW per meal) for 8 d followed by the same diet supplemented with L-Met (2.6 g/kg of dietary DM) for 5 d. Similarly, seven calves received successively the basal diet supplemented with cream (2.7 g of lipid/kg of BW per meal) and the same diet supplemented with L-Met. The diet with cream induced higher triglyceridemia than the basal diet because of a marked increase in chylomicra and in very low density lipoproteins, which suggested stimulation of intestinal lipoprotein secretion. Moreover, this lipid-enriched diet stimulated the formation of very light high density lipoproteins to the detriment of heavy high density lipoproteins. These particles, the bovine counterpart of mammalian high density lipoproteins of type 1, were distributed within the density range of low density lipoproteins. Addition of L-Met in the diets increased plasma concentrations of chylomicra and very low density lipoproteins, suggesting direct stimulation of the intestinal secretion of both of these lipoproteins and of the hepatic very low density lipoproteins. No effect of L-Met was observed on the concentrations and the physicochemical properties of low and light high density lipoproteins.

Key Words: lipid-enriched diet • L-methionine • lipoprotein metabolism • preruminant calf

Submitted on May 25, 1993
Accepted on December 2, 1993




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