Table 4
Least squares means, for the effect of different amounts of a concentrate mix on intake, digestibility, faecal N, and liveweight

	Concentrate Treatment (% of liveweight)
	0		0.6		1.2		1.8		2.4		SE	Pr > F
Intake
Concentrate intake (kg DM/d)	0.00	^a	1.27	^b	2.66	^c	3.78	^d	4.29	^d	0.22	<0.0001
Guinea grass intake (kg DM/d)	2.19	^a	2.17	^a	1.94	^ab	1.56	^b	1.53	^b	0.22	0.0198
Rice straw intake (kg DM/d)	1.83	^a	1.72	^a	1.56	^a	1.11	^b	0.61	^c	0.11	<0.0001
Substitution rate (kg DM/kg DM)	n.a.		0.10	^a	0.25	^ab	0.37	^bc	0.49	^c	0.10	0.0143
¹OM intake (kg/day)	3.57	^a	4.63	^b	5.59	^c	5.93	^c	5.96	^c	0.25	<0.0001
²GE intake (MJ/d)	69.3	^a	89.7	^b	108.0	^c	114.5	^c	115.3	^c	4.9	<0.0001
³CP intake (kg/d)	0.343	^a	0.540	^b	0.732	^c	0.850	^d	0.910	^d	0.037	<0.0001
⁴EE intake (kg/d)	0.053	^a	0.121	^b	0.192	^c	0.244	^d	0.266	^d	0.011	<0.0001
⁵NDF intake (kg/d)	2.97	^a	3.01	^a	2.86	^a	2.38	^a	2.56	^a	0.33	0.2994
Digestibility period
OM digestibility (%)	54.3	^a	60.7	^b	62.8	^bc	66.9	^c	75.1	^d	2.2	<0.0001
Digestible OM intake (kg/d)	1.89	^a	2.58	^b	3.27	^c	3.69	^cd	4.25	^d	0.27	<0.0001
Gross energy digestibility (%)	75.3	^c	80.0	^bc	87.8	^a	83.3	^ab	83.2	^ab	3.1	0.0171
Digestible energy intake (MJ/d)	55.7	^a	71.2	^b	92.7	^c	93.3	^c	97.2	^c	5.3	<0.0001
CP digestibility (%)	57.04	^ab	62.1	^ab	62.36	^ab	66.6	^bc	73.03	^c	3.1	0.0019
EE digestibility (%)	25.5	^d	51.4	^c	59.7	^b	71.8	^a	76.7	^a	3.9	<0.0001
NDF digestibility (%)	59.7	^a	57.4	^a	48.6	^b	41.9	^b	43.1	^b	4.0	0.0012
Faecal N (kg/d)	0.025	^a	0.0321	^b	0.0413	^c	0.0422	^c	0.0386	^c	0.0022	<0.0001
Liveweight
Initial liveweight (kg)	199	^a	206	^a	200	^a	195	^a	200	^a	31.4	0.9983
Final liveweight (kg)	208	^a	248	^b	266	^bc	271	^c	279	^c	6.2	<0.0001
Liveweight gain (kg/d)	0.092	^a	0.577	^b	0.792	^c	0.843	^c	0.943	^c	0.074	<0.0001