Table 5.
Correlation matrix (Pearson coefficient and p-values in brackets; n = 12) of chemical composition of tomato pomace samples with gas production parameters, dry matter effective degradability (DMED), fermentation parameters measured in 24-h in vitro incubations, in situ rumen degradability of dry matter (DM) and crude protein (CP) after 16 h of incubation, and in vitro intestinal digestibility of CP (only p < 0.10 values are shown) 1.
| Item | OM 2 | NDF | ADF | Lignin | Lignin/NDF | N | EE | TSP |
|---|---|---|---|---|---|---|---|---|
| Gas production parameters 3 | ||||||||
| PGP | 0.860 (<0.001) | 0.552 (0.063) | −0.590 (0.044) | |||||
| AGPR | −0.892 (<0.001) | −0.646 (0.023) | ||||||
| DMED | −0.684 (0.014) | −0.770 (0.003) | −0.741 (0.006) | |||||
| Fermentation parameters | ||||||||
| Total volatile fatty acid (VFA) production | −0.857 (<0.001) | 0.549 (0.064) | −0.613 (0.034) | |||||
| CH4 | −0.789 (0.002) | 0.617 (0.033) | ||||||
| In situ degradability and in vitro intestinal digestibility | ||||||||
| In situ rumen DM degradability | −0.838 (0.001) | −0.726 (0.008) | −0.699 (0.011) | 0.600 (0.039) | 0.559 (0.059) | |||
| In situ rumen CP degradability | −0.724 (0.008) | 0.796 (0.002) | ||||||
| In vitro intestinal digestibility of CP | 0.568 (0.054) | −0.511 (0.090) | −0.744 (0.006) | |||||
| Total digestibility of CP | −0.516 (0.086) | 0.790 (0.002) | ||||||
1 Total sugars and acid detergent insoluble N (ADIN) were not correlated to any of the analyzed parameters. 2 OM: Organic matter; NDF: Neutral detergent fiber; ADF: Acid detergent fiber; EE: Ether extract; TSP: Total soluble polyphenols. 3 PGP: Potential gas production (mL/g dry matter); AGPR: Average gas production rate until it has reached half of PGP (mL/h); DMED: Calculated for a rumen particulate outflow of 4% per h (%).