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Free AA in plasma and muscle were monitored in 36 dairy cows from 2 wk before until 15 wk after parturition. Cows were kept indoors and fed individually. The AA concentrations in plasma from 6 to 15 wk of lactation were compared with precalving concentrations. Plasma concentrations of Met, Phe, Glu, and Gln decreased by 16, 24, 25, and 25%, respectively. The ranking of the essential AA according to...