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Estimated percent body fat of aged mares supplemented with either 50 mg/kg body weight (BW) of arginine (treatment; ARG, n = 5), or the same diet supplemented with 100 mg/kg BW of l-alanine to achieve isonitrogenous diets (control; CON, n = 4) throughout gestation. Main effects included diet (P = 0.13), day (P = 0.93), and diet × day (P = 0.03). * Within time point, refers to a dietary difference (P < 0.05).
