Table 3.

Performance parameters during an 80-d feedlot receiving from beef steers supplemented or not (no immunomodulatory ingredient supplementation during feedlot receiving [CON]; n = 6) with immunostimulant ingredients (IPF¹ [n = 6] and OMN² [n = 6]) from d 0 to 30 of the receiving period³

Item	CON	IPF	OMN	SEM	P-value
Initial BW (d −1), kg	219	220	220	7	0.99
Final BW (d 81), kg	320a	307b	282c	4	<0.01
ADG, kg/d	1.23a	1.06b	0.76c	0.06	<0.01
DMI, kg/d
Hay	3.19	3.06	3.10	0.25	0.93
Concentrate	4.64	4.63	4.69	0.06	0.77
Total	7.83	7.69	7.79	0.30	0.94
G:F,4 g/kg	173a	152a	107b	14	0.01

^a–cValues within rows with different superscripts differ (P ≤ 0.05).

¹IPF = 2 oral capsules of Stocker Immune Primer on d 0 + 15 g/steer daily (as-fed basis) of Stocker Preconditioned Premix (Ramaekers Nutrition, Santa Cruz, CA) from d 7 to 30.

²OMN = supplementation with OmniGen-AF (22 g/steer daily, as-fed basis, from d 0 to 30; Phibro Animal Health Corp., Teaneck, NJ).

³Steer shrunk BW was obtained after road transport (800 km for 12 h) on d −1 and after 16 h of water and feed withdrawal on d 81. Steer ADG was calculated using initial and final BW. Feed intake was recorded daily from d 0 to 80 by measuring feed offered and refusals from each pen, divided by the number of steers within each pen, and expressed as kilograms per steer per day.

⁴Calculated using total DMI from d 0 to 80 and BW gain of each pen from d −1 to d 81.