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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, Alpharetta, GA, USA) or rumen-protected choline (CHOL; ReaShure, Balchem Inc., New Hampton, NY, USA) on circulating concentrations of arginine, lysing, methionine, threonine, tryptophan, and total essential AA (EAA). Values are means, with standard errors represented by vertical bars.
