Table 2.
Effects of xylooligosaccharides (XOS), exogenous enzyme (EXE) and their combinations on dry matter intake, milk production, and feed efficiency in lactating Jersey cows
| Item | CON1 | XOS | EXE | XOS + EXE | P-value |
|---|---|---|---|---|---|
| BW, kg | 458 ± 79.1 | 446 ± 62.0 | 463 ± 86.1 | 447 ± 59.7 | 0.16 |
| DM intake, kg/d | 17.5 ± 1.71 | 17.9 ± 1.59 | 17.7 ± 1.82 | 17.4 ± 2.37 | 0.06 |
| Milk yield, kg/d | 18.4 ± 0.41b | 19.6 ± 1.06a | 18.9 ± 0.75a | 19.4 ± 1.10a | < 0.01 |
| ECM2, kg/d | 22.4 ± 1.52c | 24.6 ± 1.38a | 23.4 ± 0.66b | 23.2 ± 1.42b | < 0.01 |
| True protein, % | 3.87 ± 0.106b | 4.14 ± 0.227a | 4.07 ± 0.219a | 4.05 ± 0.502a | 0.04 |
| Fat, % | 5.43 ± 1.142b | 5.56 ± 2.073a | 5.57 ± 1.471a | 5.52 ± 1.511a | 0.02 |
| Lactose, % | 3.9 ± 0.48b | 4.1 ± 0.95a | 4.2 ± 0.65a | 4.0 ± 0.44a | 0.04 |
| MUN, mg/dL | 15.8 ± 1.34 | 16.2 ± 2.15 | 15.0 ± 1.37 | 16.0 ± 2.11 | 0.09 |
| Milk yield/DM intake | 1.08 ± 0.099b | 1.12 ± 0.251a | 1.07 ± 0.228b | 1.11 ± 0.248a | 0.040 |
| ECM/DM intake | 1.28 ± 0.164c | 1.37 ± 0.173a | 1.31 ± 0.306b | 1.32 ± 0.131b | < 0.01 |
1CON Control (no feed additives), XOS 25 g/d per cow, EXE 15 g/d per cow, XOS + EXE Combination of XOS and EXE. Data are given as mean ± standard error of means
2ECM Energy corrected milk yield, calculated according to Sjaunja et al. [27]
a–cMeans within a row with different superscripts are significantly different (P < 0.05)