Table 5.

Effect of experimental diets on diversity in genera in the fecal archaeal community.

Genera	Treatments				SEMa	P-value
	C20	C40	C60	C80		Linear	Quadratic	Cubic
Methanobrevibacter	49.57	30.07	45.45	26.90	6.459	0.24	0.96	0.14
Methanosphaera	0.32	0.23	0.17	0.07	0.061	0.01	0.95	0.76
Methanocorpusculum	32.90	57.99	38.14	61.99	8.303	0.19	0.96	0.10
Methanimicrococcus	< 0.01	< 0.01	< 0.01	0.03	0.008	0.29	0.66	0.28
Methanosarcina	< 0.01	< 0.01	< 0.01	< 0.01	< 0.01	0.21	0.35	0.68
Nitrososphaera	< 0.01	< 0.01	< 0.01	< 0.01	< 0.01	0.60	0.26	0.14

^aSEM, standard error of the mean.

C20, diet contained 20% of concentrate; C40, diet contained 40% of concentrate; C60, diet contained 60% of concentrate; C80, diet contained 80% of concentrate.