Fig. 2

The dynamics of proteinase activity (a) and the levels of nitrogen fractions (b) during the ensiling of total mixed ration (TMR) silage. Error bars represent the standard errors of the means. DM, dry matter; TN, total nitrogen; NPN, non-protein nitrogen; Peptide-N, peptide nitrogen; AA-N, amino acid nitrogen; NH3-N, ammonia-nitrogen. T0, TMR with 0% wet distillers’ grains (DM); T15, TMR with 15% wet distillers’ grains (DM); T30, TMR with 30% wet distillers’ grains (DM)