Category

Control

DIET1

DIET2

DIET3

DIET4

P (Sig.)

Mean

Se

Mean

Se

Mean

Se

Mean

Se

Mean

Se

CH₄ (l/day)

180.88^a

0.90

177.50^ab

0.74

176.05^b

0.95

172.28^cd

1.44

168.28^d

0.48

0.000

Heat production (MJ)

20.14^a

0.57

19.74^abc

0.55

18.53^bc

0.35

18.44^c

0.15

19.75^ac

0.20

0.005

CO₂ (l/day)

925.92^a

2.65

907.66^abc

25.66

852.22^bc

16.35

848.15^c

7.33

908.23^ac

9.33

0.005

CH₄/ CO₂

0.195^abc

0.001

0.196^abc

0.006

0.207^ac

0.005

0.203^c

0.003

0.185^b

0.002

0.012