Table 6 Description of quality traits measured on stem material of 23 maize silage hybrids diverging in cell wall digestibility
Trait | Unit | Description |
|---|---|---|
CW | g kg−1 DM | Stem cell wall content; determined as neutral detergent fiber (NDF) |
Cel | g kg−1 DM | Stem cellulose content; determined as the difference between acid detergent fiber (ADF) and acid insoluble lignin (ADL) |
Lig | g kg−1 DM | Stem acid insoluble lignin content; determined as ADL |
Cel/CW | g kg−1 CW | Stem cellulose content relative to cell wall content (CW) |
Hem/CW | g kg−1 CW | Stem hemicellulose content relative to cell wall content (CW) |
Lig/CW | g kg−1 CW | Stem acid insoluble lignin content relative to cell wall content (CW) |
pCa I | g kg−1 CW | Esterified p-coumaric acid released after alkaline hydrolysis of the cell wall at 25 °C |
pCa II | g kg−1 CW | Total p-coumaric acid released after alkaline hydrolysis of the cell wall at 170 °C |
FA I | g kg−1 CW | Esterified ferulic acid released after alkaline hydrolysis of the cell wall at 25 °C |
FA II | g kg−1 CW | Total ferulic acid released after alkaline hydrolysis of the cell wall at 170 °C |
Di-FA I | g kg−1 CW | Esterified di-ferulic acid released after alkaline hydrolysis of the cell wall at 25 °C |
Di-FA II | g kg−1 CW | Total di-ferulic acid released after alkaline hydrolysis of the cell wall at 170 °C |
DHS | % | Degree of hemicellulose substitution, expressed as the ratio of cell wall arabinose to cell wall xylose (Ara/Xyl) |
H | g kg−1 CW | H lignin content estimated as 4-p-hydroxybenzaldehyde released following nitrobenzene oxidation of the cell wall at 170 °C |
S | g kg−1 CW | S lignin content estimated as syringylaldehyde released following nitrobenzene oxidation of the cell wall at 170 °C |
G | g kg−1 CW | G lignin content estimated as vanillin released following nitrobenzene oxidation of the cell wall at 170 °C |
Glu-Sol | g kg−1 DM | Amount of glucose released from 1 g of dry biomass into pretreatment liquors following thermochemical pretreatment |
Glu-Rel | g kg−1 DM | Amount of glucose released from 1 g of dry biomass after pretreatment and enzymatic saccharification |
Glu-Con | % CW glucose | Percentage of total cell wall glucose released after pretreatment and enzymatic saccharification |
CWD | % NDF | In vitro ruminal cell wall digestibility; determined as the difference in NDF content before and after sample incubation in rumen liquor for 48 h relative to NDF content prior to incubation |