Table 10.

Effect of standardized ileal digestible (SID) lysine (Lys) and duration of feeding Cu on carcass characteristics of finishing pigs, Exp. 2¹

SID Lys,2 %	92.5				100.0
Early added Cu3:	−	+	−	+	−	+	−	+
Late added Cu4:	−	−	+	+	−	−	+	+		Probability,5P <
Treatment:	A	B	C	D	E	F	G	H	SEM	Cu × SID Lys6	Cu7	SID Lys8
Carcass characteristics
HCW, kg	97.8	99.1	99.9	100.3	100.5	100.8	100.2	101.1	0.99	0.244	0.076	0.043
Carcass yield,9 %	75.06	76.11	75.74	76.74	75.89	75.35	75.60	75.76	0.383	0.022	0.048	0.847
Backfat,10 mm.	18.4	18.0	17.2	17.3	16.9	17.1	18.2	18.1	0.48	0.011	0.780	0.279
Loin depth,10 mm.	56.0	55.7	56.5	56.5	56.9	56.2	55.4	56.2	0.45	0.117	0.953	0.289
Lean,10 %	55.78	55.56	56.53	56.51	56.97	56.26	55.42	56.29	0.450	0.115	0.953	0.286
Carcass performance
HCW ADG,11 kg	0.649	0.661	0.667	0.671	0.672	0.675	0.670	0.677	0.007	0.232	0.064	0.035
HCW G:F12	0.269	0.272	0.278	0.279	0.278	0.282	0.275	0.278	0.003	0.071	0.086	0.198

¹A total of 1,267 pigs (PIC 337 × 1050 PIC, Hendersonville, TN; initial BW = 26.4 ± 0.1 kg) were used in a 120 d study; 6 pens per treatment and 26 to 27 pigs per pen.

²SID Lys values are expressed as the percentage of estimated SID Lys requirement for these pigs in this environment and production stage.

³150 mg/kg copper from tribasic copper chloride (TBCC; Intellibond C; Micronutrients, Inc.) fed from day 0 to 60.

⁴150 mg/kg copper from TBCC fed from day 60 to 120.

⁵No Early Cu × Late Cu × SID Lys, Early Cu × SID Ly, Late Cu × SID Lys, or Early Cu × Late Cu interactions, or early Cu vs. late Cu main effects, were observed.

⁶Contrast between Treatments A and H vs. D and E.

⁷Contrast between Treatments A and E vs. D and H.

⁸Contrast between Treatments A and D vs. E and H.

⁹Carcass yield determined by dividing HCW at the plant by live BW at the farm prior to transport.

¹⁰HCW was used as a covariate.

¹¹HCW ADG = (HCW − (day 0 wt. × 75% yield)) ÷ 120 d.

¹²HCW G:F = (HCW − (day 0 wt. × 75% yield)) ÷ (ADFI × 120 d).