Table 7.

Carcass Quality and Yield grade 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
Prime, %	7.0	5.5	1.14	0.10	4.7b	6.6ab	7.5a	1.23	0.04	0.13
Choice, %	78.1	77.9	1.91	0.92	78.2	77.0	78.8	2.08	0.65	0.56
Select, %	14.3	15.5	2.39	0.49	16.2	16.0	12.5	2.53	0.14	0.93
No roll, %	0.6	1.1	0.29	0.17	0.9	0.4	1.2	0.34	0.15	0.12
Yield Grade 1, %	7.8	9.7	1.30	0.10	8.4	10.2	7.7	1.43	0.21	0.87
Yield Grade 2, %	28.2	36.2	1.12	0.01	35.2	33.7	27.8	1.35	0.01	0.01
Yield Grade 3, %	41.2	38.3	1.43	0.06	42.5	38.2	38.6	1.63	0.05	0.01
Yield Grade 4, %	19.1	13.3	1.17	0.01	12.4b	15.2b	21.2a	1.34	0.01	0.26
Yield Grade 5, %	3.7	2.5	0.60	0.15	1.5b	2.7b	4.7a	0.72	0.01	0.91
HCW ≥ 454 kg, %	1.6	2.2	0.37	0.22	0.3	1.5	4.0	0.45	0.01	0.06

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.

²Pooled within factor SE from the ILINK option (SAS Inst., Cary, NC).

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