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Effects of supplementing multiparous Holstein cows during the periparturient period (−21 through 30 days around parturition) with rumen-protected methionine (MET; Smartamine M, Adisseo NA) or rumen-protected choline (CHOL; ReaShure, Balchem Inc.) on proportions of circulating 1-methyl histidine, 3-methyl histidine, γ-amino butyric acid, carnosine, citrulline, and urea. Values are means, with standard errors represented by vertical bars.
