Table 5.

Effects of eucalyptus oil (EUC) and anise oil (ANI) on urinary excretion of purine derivatives (PD) and methane emission in sheep

Items	Treatment1			SEM	P value
	Control	EUC	ANI
Urine PD, mmol/d
Allantoin	14.08a	10.38b	9.73b	2.074	0.04
Uric acid	0.72	0.58	0.60	0.106	0.38
Xan + hypoxanthine	3.07	2.75	2.27	0.338	0.40
Total PD2	17.9	13.7	13.0	2.39	0.06
BW0.75, kg	23.5	24.1	23.4	1.41	0.16
CH4
L/d	52.0	54.0	45.7	6.58	0.08
L/kg BW0.75/d	2.22	2.22	1.97	0.267	0.23
L/kg of DMI	26.6	29.1	28.5	2.81	0.74
L/kg of digestible DMI	41.8	45.5	46.5	3.84	0.66

^a,bMeans in the same row not bearing a common superscript letter are significantly different (P < 0.05).

¹Three treatments: control (fed a control diet, consisted of corn concentrate, soybean meal, and Chinese wildrye hay with concentrate:forage = 60:40), EUC treatment (control diet supplemented with 0.5 g/d/head EUC), ANI treatment (control diet supplemented with 0.5 g/d/head ANI).

²Purine derivatives (PD) were estimated as the sum of allantoin, uric acid, and Xan + hypoxanthine.