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Fourteen 2-yr-old Quarter Horses and Quarter Horse × Thoroughbreds were randomly assigned to either a control (CTRL) diet or a diet supplemented with 6.4% soybean oil (SBO). The amounts of both diets that were fed met current NRC nutrient requirements and were isoenergetic with similar nutrient:energy ratios. Venous blood samples (20 mL) were taken at d 0, 30, 60, and 90 of the experiment and analyzed for serum α-tocopherol, serum cholesterol, and serum triglyceride. The sum of serum cholesterol and serum triglyceride values was used as an estimate of serum total lipid. The ratio of serum α-tocopherol: serum total lipid was used as a measure of vitamin E status of horses. The SBO group had higher serum cholesterol concentrations (P < .001) at 30, 60, and 90 d. Serum triglyceride was not affected by diet. Serum total lipids tended to be greater (P < .06) for the SBO group. Serum α-tocopherol was …