Table 1.
In vitro fermentation characteristics and feeding value of single feeds
| Single feed | In vitro gas production | dOM | ME | uCP | IDRUP | CP fractions | EDCNCPS | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| bGP (ml/200 mg DM) | cGP (%/h) | GP24 (ml/200 mg DM) | (%) | (MJ/kg DM) | k = 5%/h (g/kg DM) | k = 8%/h (g/kg DM) | (%) | A (%) | B1 (%) | B2 (%) | B3 (%) | C (%) | k = 5%/h (%) | k = 8%/h (%) | |
| Maize | 92 | 5.7 | 81 | 96 | 14.5 | 163 | 158 | 83 | 12.5 | 5.9 | 66.6 | 14.9 | 0.0 | 65 | 55 |
| Wheat | 70 | 8.3 | 78 | 96 | 14.2 | 180 | 198 | 35 | 9.8 | 22.2 | 63.5 | 4.4 | 0.0 | 80 | 73 |
| Barley | 81 | 7.7 | 75 | 92 | 13.6 | 162 | 175 | 47 | 11.4 | 16.4 | 62.3 | 5.0 | 5.0 | 76 | 69 |
| Soya beans | 47 | 10.8 | 46 | 79 | 16.0 | 227 | 282 | 71 | 4.5 | 4.8 | 82.7 | 6.4 | 1.6 | 56 | 45 |
| Soya bean meal | 56 | 8.0 | 51 | 92 | 13.3 | 279 | 356 | 83 | 2.9 | 8.4 | 83.8 | 3.6 | 1.2 | 72 | 62 |
| Rapeseed meal | 50 | 8.5 | 45 | 78 | 11.3 | 241 | 280 | 26 | 7.1 | 13.4 | 62.5 | 10.2 | 6.8 | 73 | 65 |
| Sunflower meal | 39 | 8.9 | 36 | 65 | 9.4 | 166 | 205 | 46 | 8.3 | 27.3 | 54.6 | 5.9 | 3.9 | 76 | 69 |
| Faba beans | 70 | 8.3 | 63 | 90 | 12.9 | 202 | 224 | 32 | 12.7 | 42.3 | 38.7 | 4.2 | 2.1 | 80 | 75 |
| DDGS | 51 | 8.7 | 44 | 73 | 11.9 | 275 | 296 | 75 | 20.6 | 0.0 | 44.1 | 11.8 | 23.6 | 55 | 50 |
| Maize gluten | 62 | 6.8 | 54 | 78 | 11.0 | 188 | 196 | 59 | 48.5 | 6.2 | 33.8 | 8.6 | 2.9 | 79 | 75 |
| Wheat bran | 57 | 9.9 | 52 | 72 | 10.9 | 144 | 158 | 18 | 12.5 | 21.1 | 49.4 | 13.6 | 3.4 | 80 | 74 |
| Sugar beet pulp | 78 | 9.4 | 74 | 90 | 13.2 | 182 | 199 | 67 | 39.9 | 0.0 | 29.2 | 24.8 | 6.2 | 82 | 78 |
bGP = potential gas production; cGP = rate of gas production; GP24 = corrected gas production at 24 h; dOM = digestibility of organic matter; ME = metabolisable energy; uCP = utilisable CP for ruminal passage rates (k) of 5 and 8%/h; IDRUP = intestinal digestibility of rumen-undegraded protein; CP fractions = crude protein fractions: A = non-protein nitrogen; B1 = rapidly degradable true protein; B2 = moderately degradable true protein; B3 = slowly degradable true protein, C = undegradable and indigestible true protein, determined using Cornell Net Carbohydrate and Protein System (CNCPS); EDCNCPS = effective protein degradation for ruminal passage rates of 5 and 8%/h, calculated using Fox et al. (2003); DDGS = dried distillers’ grains with solubles.