Table 5.
Correlations among fiber composition, in vitro DM digestibility (IVDMD), and asymptotic gas production in 3 high-fiber ingredients: wheat straw (WS), soybean hulls (SBH), and corn distiller's dried grains with solubles (DDGS)1
| Item | Ingredients | TDF2 | NDF | ADF | IVDMDf,3 % |
|---|---|---|---|---|---|
| IVDMDh4 | WS | −0.79* | −0.82* | −0.42 | |
| SBH | −0.65* | −0.74* | −0.78* | ||
| Corn DDGS | −0.22 | −0.72* | −0.73* | ||
| WS + SBH + corn DDGS | −0.98* | −0.98* | −0.99* | ||
| IVDMDf | WS | −0.08 | −0.04 | 0.20 | |
| SBH | 0.23 | 0.11 | 0.02 | ||
| Corn DDGS | −0.14 | 0.41 | 0.48† | ||
| WS + SBH + corn DDGS | −0.07 | −0.11 | 0.00 | ||
| A5 | WS | −0.15 | −0.14 | 0.15 | 0.27 |
| SBH | 0.26 | 0.25 | 0.44† | −0.01 | |
| Corn DDGS | −0.14 | 0.41 | 0.48† | −0.64 | |
| WS + SBH + corn DDGS | −0.34* | −0.40* | −0.27† | 0.84* |
1
Pearson correlation coefficients (r).
2
TDF = total dietary fiber.
3
IVDMDf = in vitro DM digestibility from simulated large intestine fermentation.
4
IVDMDh = in vitro DM digestibility from simulated gastric and small intestinal hydrolysis.
5
A = asymptotic gas production, expressed as milliliters per gram of DM of substrate.
*Significant correlation (P ≤ 0.05).
†Correlation trend (0.05 < P < 0.10).