Table 1.

Alpha diversity index of rumen bacteria among all treatments.

Indices	U0		U5		SEM	P-value
	A0	A0.45	A0	A0.45		Urea	AHA	Urea*AHA
Observed_species	1442	1496	1557	1563	25	0.11	0.54	0.62
Good's coverage	0.914a	0.911ab	0.905b	0.906b	0.002	0.02	0.62	0.46
PD_whole_tree	106b	109ab	111a	109ab	0.89	0.09	0.70	0.11
Chao 1	2860c	2942bc	3142a	3043ab	43	0.01	0.85	0.11
Shannon	7.59	7.73	7.77	7.59	0.08	0.92	0.92	0.46
Simpson	0.96	0.96	0.97	0.95	0.01	0.89	0.50	0.36

^a−cMean values within a row with different letters differ significantly (P < 0.05). SEM, standard error of the mean. U0, basic diet without urea; U5, basic diet plus urea of 5 g/kg DM; A0, basic diet without AHA; A0.45, basic diet plus AHA of 0.45 g/kg DM.