Table 5.

Carcass traits of heifers in experiment 2¹

	Implant				Days on feed (DOF)					Implant × DOF
Item	SINGLE	REPEATED	SEM2	P-value	150	171	192	SEM2	P-value	P-value
Carcasses, n	1,790	1,793	—	—	1,209	1,191	1,183	—	—	—
HCW, kg	381	382	1.1	0.36	367c	382b	396a	1.3	0.01	0.24
HCW gain, kg3	186	186	1.1	0.65	171c	186b	201a	1.3	0.01	0.22
Dress, %4	63.90	64.31	0.169	0.02	63.86b	64.03ab	64.43a	0.207	0.03	0.56
Back fat, cm	1.88	1.80	0.023	0.01	1.73c	1.83b	1.98a	0.028	0.01	0.23
LM area, sq cm	93.48	95.81	0.432	0.01	92.26c	95.23b	96.45a	0.374	0.01	0.61
Marbling5	510	510	6.6	0.98	502b	501b	528a	8.0	0.01	0.65

¹Treatments were: Implanted with either Revalor-XH (80 mg TBA and 8 mg E₂, uncoated; 120 mg TBA and 12 mg E₂, coated; 200 mg TBA and 20 mg E₂, total) on arrival or Revalor-IH (80 mg TBA and 8 mg E₂, uncoated) on arrival followed by Revalor-200 (200 mg TBA and 20 mg E₂, uncoated) at approximately 90 DOF and cattle harvest at 150, 171, or 192 days on feed.

²The SE of the difference between treatment means (SAS Inst., Cary, NC).

³Initial HCW = initial BW × 0.58.

⁴Calculated as (HCW/final BW pencil shrunk 4%).

⁵400 = small0

⁶Estimated empty body fat (%) according to Guiroy et al., 2002.

^a,b,cMeans within row are different (P < 0.05).