. 2022 Aug 2;100(9):skac246. doi: 10.1093/jas/skac246

Table 2.

Treatment averages of individual body weights (BW), average daily gain (ADG), off-truck shrink percentage, pretrucking dry matter intake (DMI), and feed efficiency (G:F) of feedlot steers fed increasing concentrations of supplemental Zn

	Treatment¹				Contrasts
	CON	IND	SUPZN	SEM	Linear	Quadratic	No Zn vs Zn
	n = 18 steers	n = 18 steers	n = 18 steers
BW², kg
days –26/25	297	297	297	2.8	0.91	0.99	0.93
Day 0³	359	355	362	2.5	0.58	0.07	0.80
Day 1⁴	330	327	332	2.1	0.56	0.07	0.83
Day 6	361	361	363	3.0	0.78	0.78	0.89
Days 27/28	404	412	414	5.1	0.15	0.76	0.15
ADG, kg/d
Day –25 to –1	2.40	2.31	2.47	0.10	0.69	0.29	0.94
Days 1 to 6	6.22	6.84	6.05	0.38	0.86	0.13	0.63
Days 6 to 28	1.93	2.31	2.34	0.13	0.02	0.39	0.02
Days 1 to 28	2.73	3.15	3.03	0.14	0.10	0.16	0.04
Trucking shrink, %	8.10	7.97	8.13	0.30	0.98	0.69	0.89
DMI⁵, kg/d
Days –5 to –1⁶	9.5	9.8	9.6	0.36	0.75	0.53	0.58
G:F
Days 1 to 6⁶	0.765	0.751	0.647	0.039	0.15	0.40	0.32
Days 6 to 28⁶	0.215	0.238	0.231	0.015	0.41	0.46	0.29
Days 1 to 28⁶	0.319	0.329	0.304	0.021	0.66	0.47	0.91

Dietary treatments were: control (CON; no supplemental Zn), industry (IND; 70 mg supplemental Zn/kg DM), and supranutritional Zn (SUPZN; 120 mg supplemental Zn/kg DM); all supplemented Zn provided via Plexomin Zn (Phytobiotics, Cary, NC).

Days –26/25 BW covariate was applied during analysis.

On-truck – BW recorded after feeding and directly before loading onto trailer for 18-h transportation event.

Off-truck – BW recorded directly after unloading prior to feed access.

Posttransit DMI data are displayed in Figures 1 and 2.

Outliers removed: DMI (days –5 to –1) – 1 IND; G:F (days 1 to 6) – 1 CON, 1 SUPZN; G:F (days 6 to 28) – 1 SUPZN; G:F (days 1 to 28) – 1 SUPZN