Table 2.

Forage, concentrate, and total dry matter intake (DMI), as well as mineral salt intake of Bos indicus steers receiving a high-forage (Cynodon dactylon spp.) diet and supplemented or not (CONT; n = 10) with 13 (13NAR; n = 10) or 20 (20NAR; n = 10) ppm of narasin (Zimprova; Elanco Animal Health, São Paulo, SP, Brazil) throughout the experimental period¹

	Treatments				P-Value2
Item	CONT	13NAR	20NAR	SEM	T	P	T × P	CONT vs. NAR	13NAR vs. 20NAR
Intake3
Forage, kg	6.31	6.37	6.24	0.156	0.86	<0.0001	0.27	0.96	0.59
Forage g/kg BW	1.94	1.98	1.93	0.015	0.91	<0.0001	0.29	0.96	0.60
NDF, kg	4.29	4.33	4.24	0.026	0.88	<0.0001	0.32	0.93	0.63
NDF, g/kg BW	1.32	1.35	1.31	0.010	0.92	<0.0001	0.34	0.97	0.62
Supplement,4 g	58.6	60.0	57.1	1.39	0.36	<0.0001	0.78	0.98	0.15
Total, kg	6.37	6.43	6.30	0.176	0.23	<0.0001	0.27	0.34	0.16
Mineral intake,5 g	142.6	156.4	120.6	14.51	0.22	<0.0001	0.56	0.82	0.08

¹Treatments were offered on a daily basis throughout the experimental period (day 0 to 140). Forage was offered in amounts to ensure ad libitum consumption throughout the experimental period (day 0 to 140).

²T = treatment effect; P = period effect; T × P = treatment × period interaction; CONT vs. NAR = unsupplemented vs. narasin-supplemented animals; 13NAR vs. 20NAR = dose effect of 13 vs. 20 ppm of narasin.

³Forage and concentrate DMI were measured on a daily basis throughout the experimental period (day 0 to 140).

⁴Supplement = 50:50 mixture of soybean hull and corn, containing (13NAR and 20NAR) or not (CONT) narasin.

⁵Mineral intake was measured on a weekly basis.