Table 4.

Mean, standard error of the mean (SEM), and phenotypic correlation for carcass trait of small-sized meat ducks classified as low-, medium-, and high-residual feed intake (RFI) or low-, medium-, and high-residual intake and gain (RIG).

Trait	RFI					RIG					Correlation coefficients
	Low	Medium	High	SEM	P value	Low	Medium	High	SEM	P value	RFI	RIG
Carcass yield (%)	80.39	80.69	81.02	0.21	0.130	80.62	80.74	80.80	0.231	0.827	0.205	−0.085
Semieviscerated yield (%)	76.20	76.11	76.48	0.237	0.538	76.28	76.01	76.34	0.235	0.600	0.092	−0.114
Eviscerated yield (%)	70.44	69.76	70.79	0.336	0.110	70.09	70.61	70.51	0.378	0.570	0.067	−0.071
Breast muscle yield (%)	8.38	8.36	8.32	0.176	0.973	8.40	8.15	8.39	0.199	0.632	0.008	−0.159
Thigh muscle yield (%)	12.16	12.52	12.04	0.161	0.110	12.21	12.33	12.39	0.189	0.786	−0.059	−0.021
Abdominal fat yield (%)	1.74	1.81	1.79	0.090	0.853	1.75	1.86	1.67	0.104	0.451	0.051	0.107
Gizzard yield (%)	3.11	3.23	3.22	0.075	0.478	3.22	3.17	3.10	0.074	0.587	0.092	−0.107
Heart yield (%)	0.491	0.485	0.50	0.010	0.585	0.50	0.49	0.49	0.011	0.696	0.170	−0.117
Liver yield (%)	1.794	1.835	1.82	0.025	0.434	1.82	1.84	1.81	0.028	0.708	0.070	−0.069
Lean meat yield (%)	20.44	20.86	20.46	0.222	0.343	20.48	20.63	20.78	0.256	0.681	0.027	−0.163
Skin fat yield (%)	27.02b	26.46b	28.21a	0.411	0.013	27.06	27.58	27.08	0.464	0.685	0.200	0.083

^aDifferent letters within a row and of the RFI or RIG classification indicate significant differences (P < 0.05).

^bDifferent letters within a row and of the RFI or RIG classification indicate significant differences (P < 0.05).