. 2019 Feb 20;97(5):2202–2219. doi: 10.1093/jas/skz077

Table 2.

Descriptive statistics for temperament, movement, and rumen function traits for a 10-wk feedlot RFI test and their correlations with midparent RFI_p-EBV, DMI and RFI for 59 Angus steers and heifers¹ bred to vary in genetic merit for postweaning RFI

						Correlations
Trait	Units	Mean	SD	Min.	Max.	RFI_p-EBV_mp²	DMI	RFI_f
Temperament
Crush score	1 to 5	2.6	0.5	2.0	3.8	−0.12	−0.18	−0.05
Flight speed	m/s	2.0	0.8	0.9	4.0	−0.32*	−0.29*	−0.22^†
Movement
Feeder visits	Counts/d	42.4	8.2	24.7	61.6	0.45***	0.23^†	0.53***
Water visits	Counts/d	12.8	3.7	7.2	23.4	0.16	−0.19	−0.02
GEM visits	Counts/d	9.2	3.3	0.0	16.2	−0.27*	−0.09	−0.03
Distance	m/d	325	53	236	458	0.20	−0.10	0.12
Digestive function
DMD	%	69.6	2.0	65.9	75.0	−0.13	−0.27*	−0.29*
Total VFA³	mM	77	24	29	132	−0.14	−0.17	−0.16
Acetate	mM	40	12	17	73	−0.08	−0.13	−0.13
Propionate	mM	26	11	5.4	52	−0.24^†	−0.21	−0.17
Butyrate	mM	7.7	4.0	2.6	25	0.02	−0.04	−0.06
Isobutyrate	mM	0.46	0.21	0.13	1.05	−0.07	−0.08	−0.10
Valerate	mM	0.87	0.35	0.30	1.8	−0.31*	−0.38**	−0.35**
Isovalerate	mM	2.0	1.3	0.7	8.8	0.11	0.10	0.00
Acetate %	%	53	4.4	44	64	0.23^†	0.22	0.13
Propionate %	%	33	7.4	14	44	−0.24^†	−0.21	−0.09
Butyrate %	%	10	3.6	5.7	23	0.13	0.10	0.01
MPR⁴	g/d	144	16	118	190	0.06	0.28^†	−0.05
MY⁴	g/kg	12.0	1.5	9.8	16.3	−0.23	−0.48**	−0.54***

¹Comprising 29 steers and 30 heifers.

²Midparent EBV for RFI_p.

³ N = 56 animals.

⁴ N = 41 animals (comprising 22 steers and 19 heifers) with sufficient valid records obtained from the GEM.

RFI = residual feed intake; RFI_p = RFI measured postweaning; RFI_f = RFI measured in the feedlot; GEM = Greenfeed Emission Monitor; DMD = DM digestibility; MPR = methane production rate; MY = methane yield.

^† P ≤ 0.1; *P < 0.05; **P < 0.01; ***P < 0.001.