Table 2.

Effects of steroidal implants on feedlot performance of Holstein steers

	Nonimplanted	Implanted1	SEM	P-value
n, steers	35	35
Live weight2, kg
Initial	274	276	6.420	0.83
84 days	413	440	7.364	0.01
Final	542	598	8.968	<0.01
ADG, kg/d
Days 1 to 84	1.65	1.96	0.031	<0.01
Days 85 to 186	1.27	1.54	0.036	<0.01
Days 1 to 186	1.44	1.73	0.028	<0.01
DMI, kg/d
Days 1 to 84	8.88	10.19	0.176	<0.01
Days 85 to 186	10.14	11.76	0.205	<0.01
Days 1 to 186	9.47	11.02	0.180	<0.01
G:F3
Days 1 to 84	0.188	0.193	0.003	0.35
Days 85 to 186	0.125	0.131	0.003	0.15
Days 1 to 186	0.154	0.158	0.002	0.31

¹Holstein steers implanted with 16 mg of E₂ and 80 mg of TBA (Component TE-IS with Tylan; Elanco Animal Health, Greenfield, IN) at the start of the trial (day 0), and 24 mg of E₂ and 120 mg of TBA (Component TE-S with Tylan; Elanco Animal Health) on day 84 of the trial.²Initial and final BW were calculated at the average BW of days 0 and 1, and days 185 and 186, respectively. ³G:F was calculated as the steer average ADG divided by steer average DMI within each period (days 1 to 84; days 85 to 186; days 1 to 186).