Table 3.

Estimates of genetic (below diagonal) and residual (above diagonal) correlations, heritabilities (diagonal), and their standard error of estimates among carcass and ultrasound traits for the American Simmental Association

	UFAT1	FAT2	ULMA3	LMA4	UIMF5	MRB6	BWT7	CWT8
Heritability, genetic correlation and residual correlation
UFAT	0.37 ± 0.03	N/A	0.18 ± 0.03	N/A	0.18 ± 0.03	N/A	-0.08 ± 0.04	N/A
FAT	0.28 ± 0.13	0.25 ± 0.03	N/A	-0.09 ± 0.03	N/A	0.23 ± 0.03	-0.06 ± 0.03	0.30 ± 0.03
ULMA	-0.01 ± 0.06	0.22 ± 0.12	0.44 ± 0.03	N/A	-0.04 ± 0.03	N/A	0.08 ± 0.04	N/A
LMA	-0.04 ± 0.12	-0.27 ± 0.08	0.57 ± 0.10	0.32 ± 0.03	N/A	0.01 ± 0.03	0.09 ± 0.03	0.38 ± 0.03
IMF	0.33 ± 0.06	-0.01 ± 0.11	-0.24 ± 0.06	-0.22 ± 0.10	0.42 ± 0.03	N/A	-0.08 ± 0.04	N/A
MRB	0.13 ± 0.11	0.22 ± 0.07	0.03 ± 0.10	-0.23 ± 0.07	0.73 ± 0.07	0.43 ± 0.04	-0.01 ± 0.04	0.18 ± 0.04
BWT	-0.11 ± 0.06	-0.16 ± 0.07	0.22 ± 0.06	0.23 ± 0.06	-0.16 ± 0.06	-0.11 ± 0.06	0.47 ± 0.02	0.22 ± 0.03
CWT	-0.03 ± 0.12	0.08 ± 0.08	0.52 ± 0.10	0.51 ± 0.06	-0.17 ± 0.10	-0.00 ± 0.07	0.42 ± 0.05	0.34 ± 0.03
Additive genetic variance (Vg) and phenotypic variance (Vp)
Unit	mm2	mm2	(cm2)2	(cm2)2	-	-	kg2	kg2
Vg	0.71 ± 0.07	2.81 ± 0.04	26.36 ± 2.23	19.71 ± 2.13	0.20 ± 0.02	0.29 ± 0.03	9.20 ± 0.54	278.21 ± 29.10
Vp	1.92 ± 0.04	11.12 ± 0.18	60.09 ± 1.16	62.49 ± 1.02	0.46 ± 0.01	0.67 ± 0.01	19.54 ± 0.25	817.31 ± 13.50

¹UFAT is real-time ultrasound (RTU) back fat thickness.

²FAT is carcass back fat thickness.

³ULMA is RTU longissimus dorsi muscle area.

⁴LMA is carcass longissimus dorsi muscle area.

⁵UIMF is intramuscular fat percentage, i.e., the RTU indicator of MRB.

⁶MRB is carcass marbling score.

⁷BWT is birth weight.

⁸CWT is carcass weight.