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. 2023 May 29;102(8):102818. doi: 10.1016/j.psj.2023.102818

Table 7.

Mean, standard error of the mean (SEM), and phenotypic correlation for serum metabolite and hormone concentrations 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).

Trait1 RFI
 RIG
 Correlation coefficients
Low Medium High SEM P value Low Medium High SEM P value RFI RIG
Serum metabolites
TC (mmol/L) 4.75 4.95 4.83 0.10 0.373 4.83 4.87 4.72 0.11 0.597 0.084 −0.090
TG (mmol/L) 0.63b 0.67ab 0.73a 0.03 0.024 0.71a 0.69b 0.62c 0.03 0.039 0.323* −0.415⁎⁎
HDL-C (mmol/L) 2.94 2.93 2.74 0.07 0.076 2.72 2.83 2.96 0.07 0.064 −0.332* 0.370*
LDL-C (mmol/L) 1.38 1.41 1.30 0.05 0.277 1.31 1.41 1.36 0.05 0.419 −0.165 0.130
GLU (mmol/L) 11.52 11.55 11.64 0.09 0.579 11.64 11.51 11.52 0.09 0.547 0.149 −0.110
CK (U/L) 1458.44 1438.29 1463.69 68.88 0.965 1458.76 1380.43 1445.65 62.06 0.650 −0.009 0.029
FFA (mmol/L) 0.67 0.64 0.62 0.04 0.710 0.61 0.66 0.67 0.04 0.498 −0.134 0.197
Serum hormones
INS (uIU/mL) 15.49 16.14 15.09 0.38 0.144 14.93b 16.70a 15.17ab 0.37 0.005 −0.113 0.180
GH (ng/mL) 4.88 4.75 5.24 0.15 0.082 5.29a 4.82b 4.88b 0.14 0.043 0.042 −0.065
ACTH (pg/mL) 24.74 24.06 26.16 0.73 0.142 25.51 24.60 24.44 0.85 0.637 0.105 −0.122
CCK (pmol/L) 4.03 4.17 3.84 0.19 0.477 3.83 4.20 4.10 0.20 0.406 −0.184 0.198
COR (ng/mL) 5.43 5.65 5.35 0.13 0.322 5.29 5.65 5.46 0.15 0.296 −0.170 0.133
GHR (ng/mL) 81.57 81.27 84.76 2.15 0.443 84.77 80.91 81.30 2.26 0.389 0.189 −0.214
LEP (ng/mL) 4.64 4.89 4.82 0.08 0.075 4.82 4.80 4.78 0.07 0.927 0.064 −0.044
a

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

b

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

c

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

⁎

Indicates a significant correlation (P < 0.05).

⁎⁎

Indicates an extremely significant correlation (P < 0.01).

1

TC = total cholesterol; TG = triglycerides; HDL-C = high-density lipoprotein cholesterol; LDL-C = low-density lipoprotein cholesterol; GLU = glucose; CK = creatine kinase; FFA = free fatty acid; INS = insulin; GH = growth hormone; ACTH = adrenocorticotropic hormone; CCK = cholecystokinin; COR = cortisol; GHR = ghrelin; LEP = leptin.