Table 5.
Chemical composition and gas production parameters of Saccharina latissima silages 1.
| Unwilted | Pre-Wilted | p-Value | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Item | CON | WAS | WASFAC | CON | WAS | WASFAC | SEM | Pre-Wilting | Silage Type | Pre-Wilting × Silage Type |
| Chemical composition | ||||||||||
| Ash (g/kg DM) | 278 | 264 | 268 | 302 b | 252 a | 264 a | 9.6 | 0.735 | 0.017 | 0.200 |
| N (g/kg DM) | 9.58 | 8.88 | 8.25 | 10.2 b | 8.34 a | 8.75 a | 0.264 | 0.036 | 0.009 | 0.014 |
| Acid detergent insoluble N (g/100 g total N) | 12.9 | 12.5 | 12.9 | 12.6 | 13.1 | 13.0 | 1.37 | 0.477 | 0.726 | 0.549 |
| Neutral detergent fiber (g/kg DM) | 105 | 110 | 118 | 127 | 110 | 111 | 6.0 | 0.304 | 0.570 | 0.073 |
| Acid detergent fiber (g/kg DM) | 81.4 | 86.5 | 92.5 | 84.7 | 83.0 | 85.6 | 4.1 | 0.492 | 0.353 | 0.474 |
| Lignin (g/kg DM) | 10.6 | 8.77 | 7.73 | 16.3 | 10.2 | 9.30 | 2.81 | 0.129 | 0.216 | 0.826 |
| Gas production parameters 2 | ||||||||||
| PGP (mL/g DM) | 191 | 195 | 196 | 185 a | 206 b | 203 b | 2.4 | 0.054 | <0.001 | 0.002 |
| c (%/h) | 3.36 a | 3.71 b | 3.59 ab | 3.73 a | 4.03 b | 3.64 a | 0.102 | 0.003 | 0.003 | 0.192 |
| Lag (h) | 1.32 a | 2.90 b | 1.43 a | 2.66 b | 3.66 c | 1.01 a | 0.301 | 0.026 | <0.001 | 0.015 |
| AGPR (mL/h) | 4.36 a | 4.47 ab | 4.72 b | 4.34 a | 4.89 b | 5.04 b | 0.103 | 0.006 | <0.001 | 0.088 |
| DMED (g/kg) | 453 a | 450 a | 483 b | 439 a | 430 a | 486 b | 5.5 | 0.029 | <0.001 | 0.092 |
| Potential DM degradability (g/kg) | 898 a | 914 b | 934 c | 878 a | 880 a | 925 b | 4.3 | <0.001 | <0.001 | 0.041 |
a, b, c Within each variable and pre-wilting treatment, mean values in the same row with different superscripts differ (p < 0.05). 1 CON: seaweed unwashed and ensiled without any additive; WAS: seaweed washed and ensiled without any additive; WASFAC: seaweed washed and ensiled with 4 g of formic acid per kg seaweed; 2 PGP: potential gas production; c: fractional rate of gas production, lag: time before starting gas production, AGPR: average gas production rate until half of PGP was reached; DMED: DM effective degradability calculated for a rumen particulate outflow of 3% per h; DMPD: DM potential degradability after 120 h of in vitro incubation.