Table 3.

Impacts of supplement delivery method and protein type on intake and fiber digestion of 2- and 3-year-old beef cows fed low-quality forage.

Item	RDP 1		RUP 1		SEM 3	p-Value 4
	HF 2	SF 2	HF	SF		D	P	D × P
Dry matter intake, kg d−1	11.61	13.25	12.11	12.91	0.59	0.07	0.56	0.49
Dry matter intake, g kg BW−1 d−1	21.53	24.75	22.54	24.54	1.82	0.24	0.70	0.74
Supplement intake, kg d−1	0.83	2.34	0.76	1.40	0.36	0.01	0.89	0.24
Supplement intake, g kg BW−1 d−1	1.54	3.91	1.41	2.20	0.58	0.12	0.03	0.82
Forage intake, kg d−1	10.78	10.91	11.35	11.52	0.60	0.89	0.52	0.97
Forage intake, g kg BW−1 d−1	19.98	20.24	21.11	21.72	1.27	0.89	0.54	0.89
NDF intake, kg d−1	6.63	7.81	6.89	7.32	0.37	0.04	0.63	0.33
Dry matter digestibility, %	49.10	51.17	51.37	48.05	1.44	0.32	0.28	0.08
NDF digestibility, %	42.03 a	50.27 b	46.86 ab	43.11 ab	2.61	0.05	0.20	0.04
Water intake, L d−1	48.38 a	72.60 b	52.61 ab	52.81 ab	4.87	<0.01	0.55	0.03
uNDF Fill, kg	4.47	5.11	4.89	4.12	0.47	0.35	0.54	0.15
uNDF Fill, g kg BW−1	8.22	9.29	9.28	7.7	0.90	0.38	0.42	0.15
uNDF Retention, h	62.98	73.7	68.34	56.52	6.82	0.29	0.59	0.12
uNDF Passage, % h−1	1.64	1.42	1.49	1.84	0.17	0.38	0.55	0.12

¹ Protein type of rumen degradable protein (RDP) or rumen undegradable protein (RUP). ² Delivery method of hand-fed (HF) or self-fed (SF). ³ Pooled standard error of the means presented. ⁴ Delivery (D): delivery method of HF vs. SF; protein (P): type of protein fed (RDP vs. RUP); and the interaction of delivery method and protein type (D × P). ^a,b Means that lack common superscripts differ for delivery × protein (p < 0.05).