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Effects of sodium humate and glutamine combined supplementation on the serum concentration of diamine oxidase (DAO) and D-isomer of lactic acid (D-lac) of weaned calves. Data were shown as means ± SEM (n = 10). NC, negative control (basal diet); H+G, basal diet+5% HNa and 1% Gln. *P < 0.05.
