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Effects of Dietary Protein on Blood Lipids of the Calf with Special Reference to Cholesterol

Department of Dairy Science, Virginia Polytechnic Institute, Blacksburg 24061

ABSTRACT

Abstrct: Two rations containing: 9 and 25% of crude protein were used to determine the effects of protein on blood lipid constituents of growing calves. Blood lipids from calves consuming the high-protein ration (240mg/ 100ml) were lower than those of the low protein fed calves (306mg/100ml) at 22 weeks of age (P < .05). Calves consuming low protein had more DL-mevalonic acid-2-[³H]-lactone incorporated into blood lipids and cholesterol. Urinary excretion rate of ³H labeled compounds was greatest during the first 10 hours post dosing, and cumulative excretion was 29.6 and 17.7% of administered dose for low and high protein. Calves on high-protein consumed more feed and gained faster than low-protein calves (P < .05).

¹ Present address: Department of Dairy Science, 105 Borland Laboratory, Pennsylvania State University, University Park 16802.