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Time course of plasma concentrations of retinol (a), tocopherol (b), and β-carotene (c) in dairy cows receiving placebo water (CTR; black dotted line) or cows receiving a drench of 200 g/d of Aloe arborescens Mill. whole plant homogenate between −14 and 14 days from calving (AAM; green solid line). * is p < 0.05; DFC is days from calving.
