Table 3.

Effect of different inclusion levels of SRU on true DM, NDF, ADF, and N disappearance and microbial N production in a Rusitec fed a finishing beef diet^†

						P value
	Inclusion levels of SRU, %					Treatment	Contrasts
Digestibilities, %	0	0.5	1	1.75	SEM		Linear	Quadratic
DMD	78.85	78.01	75.69	78.95	1.391	0.35	0.89	0.13
OMD	80.32	78.62	77.93	78.52	1.433	0.29	0.24	0.12
NDFD	33.34	37.69	40.18	36.18	2.624	0.06	0.21	0.017
ADFD	27.27	31.71	33.70	28.22	3.004	0.09	0.76	0.015
CPD	88.91	88.06	88.32	88.57	1.419	0.36	0.23	0.62
Microbial nitrogen, mg/day
FPB	9.11	7.52	10.48	7.81	1.044	0.56	0.74	0.48
FPA	11.58a	10.91a	14.18b	10.52a	0.751	0.02	0.76	0.037
LAB	55.42	52.09	51.27	50.90	4.578	0.41	0.51	0.71
Total	76.11	70.53	78.85	69.23	4.316	0.38	0.47	0.57
EMPS, mg microbial N/g OM fermented	11.01b,c	10.46a,b	11.64c	9.91a	0.152	0.04	0.0027	0.0010

^†All the acronyms are defined in the text.

^a–cMeans with different superscript differ (P < 0.05).