Table 5 Effects of xylooligosaccharides (XOS), exogenous enzyme (EXE) and their combinations on energy intake and output, and utilization efficiency in lactating Jersey cows

Energy intake and output, MJ/d

 GE intake

397.3 ± 4.25

405.3 ± 6.72

401.8 ± 8.41

395.0 ± 5.22

0.72

 Fecal energy output²

116.5 ± 1.05^a

112.6 ± 1.80^b

114.9 ± 2.26^a

115.3 ± 1.57^a

0.03

 Urinary energy output³

11.5 ± 1.15

11.2 ± 1.46

11.5 ± 1.01

11.4 ± 1.91

0.52

 CH₄-E output

22.4 ± 1.35^a

20.2 ± 1.01^c

21.0 ± 1.46^b

20.9 ± 1.71^b

 < 0.01

 DE intake⁴

280.4 ± 0.46^b

293.7 ± 0.25^a

287.1 ± 0.77^a

278.6 ± 0.20^b

 < 0.01

 ME intake⁵

246.9 ± 2.55^c

262.9 ± 3.26^a

254.4 ± 3.42^b

250.4 ± 1.89^b

 < 0.01

 Milk energy output

97.5 ± 5.77^d

110.4 ± 9.46^a

102.1 ± 8.52^c

104.7 ± 7.69^b

0.03

Energy utilization efficiency

 DE intake/GE intake, %

70.6 ± 2.59^c

72.6 ± 3.36^a

71.5 ± 4.03^b

70.3 ± 2.17^b

 < 0.01

 CH₄-E output/GE intake, %

5.61 ± 0.412^a

5.01 ± 0.571^c

5.22 ± 0.217^b

5.25 ± 0.639^b

 < 0.01

 Milk energy output/GE intake, %

24.6 ± 1.52^c

27.2 ± 1.73^a

25.4 ± 1.06^b

26.5 ± 1.17^b

 < 0.01

 k_l⁶

0.614 ± 0.1170

0.629 ± 0.1461

0.613 ± 0.1352

0.620 ± 0.1191

0.47