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Journal of Dairy Science Vol. 59 No. 7 1301-1305
© 1976 by American Dairy Science Association ®
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Plasma Lipids, Ketone Bodies, and Glucose Concentrations in Calves Fed High-and Low-Fat Milk Replacers

R. C. Bazin1 and G. J. Brisson

Centre de Recherches en Nutrition et, Département de Zootechnie, Université Laval, Québec, Canada G1K 7P4

ABSTRACT

Twenty-four 5-day-old male calves were fed twice daily milk replacers containing either 5% (low-fat) or 25% (high-fat) lard. Plasma lipids, blood glucose, and ketone bodies were determined in jugular blood before feeding and every hour during 8 h after feeding. The high-fat diet caused in the 1st h after feeding a sharp increase of triglycerides and phospholipids followed by a sharp decrease; these two increased slowly during the following 5 h. Within the first 2 h after feeding, there was an increase of cholesterol esters, free cholesterol, and nonesterified fatty acids. With the low-fat diet, triglycerides and cholesterol esters showed a small increase during the 4 h following meal whereas phospholipids, free cholesterol, and nonesterified fatty acids were not affected significantly. With both diets, blood glucose reached a maximum of 110 mg/100 ml 1 h after feeding; ketone bodies were not altered significantly. With the high-fat diet, lipid digestion would occur in two phases: firstly, part of the fat would be lipolyzed quickly by pregastric esterase before clot formation in the abomasum; secondly, the rest of the lipids, slowly released by progressive lysis of the coagulum would be digested under the action of gastric and pancreatic lipases. The first phase did not occur with the low-fat diet.

FOOTNOTES

1 Unité de Recherches Diététiques, Inserm, Hopital Bichat, 170 Boulevard Ney, 75018 Paris, France.






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