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

Table 3.

Descriptive statistics for age, BW, feed intake, body composition, body temperature, gut function, and metabolic rate traits measured on 57 Angus steers and heifers1 bred to vary in genetic merit for postweaning RFI fed a restricted allowance of roughage ration in individual pens followed by fasting, and their correlations with midparent RFIp-EBV and with feedlot-test DMI and RFI

Correlations
Trait Units Mean SD Min. Max. RFIp-EBVmp1 DMI RFIf2
TWT kg 544 43 460 640 −0.12 0.54*** −0.07
DMI kg/d 7.59 0.67 5.36 8.66 0.15 0.40** 0.04
Body composition
RIBFAT mm 11.3 2.0 7 18 0.51*** 0.49*** 0.53***
RUMPFAT mm 16.4 3.2 10 24 0.57*** 0.36** 0.58***
IMF % 6.6 0.7 5.1 7.9 0.23† 0.07 0.14
EMA cm2 79.6 3.9 70 86 −0.19 0.30* −0.15
RIBFAT-WT mm/kg 0.021 0.004 0.012 0.032 0.56*** 0.24† 0.54***
RUMPFAT-WT mm/kg 0.030 0.006 0.016 0.042 0.60*** 0.12 0.55***
Body protein kg 78.5 6.8 64.9 96.7 −0.34* 0.35** −0.26*
Body fat kg 121 14.8 94.1 161 0.36** 0.66*** 0.38**
Body temperature
TEMP °C 38.7 0.38 38.0 39.8 −0.17 −0.13 −0.19
RTEMP °C 0.00 0.35 −0.63 0.94 −0.25† −0.18 −0.31*
Digestive function
MPR g/d 144 18 99 195 −0.16 0.11 −0.37**
MY g/kg 19.0 1.9 15.7 25.6 −0.31* −0.20 −0.48***
Fed heat production
CPR g/d 4399 291 3566 5135 −0.20 0.40** −0.10
HP MJ/d 47.0 3.1 38.2 54.9 −0.20 0.41** −0.09
HP-WT MJ/kg 0.387 0.004 0.078 0.100 −0.06 −0.33* −0.01
RHP MJ/d 0 2.3 −4.8 5.4 −0.36** 0.19 −0.15
HP-EBP MJ/kg 0.627 0.030 0.581 0.703 0.29* −0.08 0.34*
Unfed heat production
CPR g/d 3027 255 2563 3644 −0.46*** 0.17 −0.25†
HP MJ/d 35.4 3.0 30.0 42.7 −0.46*** 0.17 −0.25†
HP-WT MJ/kg 0.065 0.005 0.054 0.08 −0.35** −0.37** −0.21
HP-EBP MJ/kg 0.472 0.034 0.391 0.561 −0.16 −0.24† −0.01

1Comprising 28 steers and 29 heifers.

2Midparent EBV for RFIp.

RFI = residual feed intake; RFIp = RFI measured postweaning; TWT = midtest BW; RIBFAT = subcutaneous fat depth at the 12th/13th rib; RUMPFAT = subcutaneous fat depth at the Australian P8 rump site; IMF = intramuscular fat content of the eye muscle; EMA = cross-sectional area of the eye muscle between the 12th and 13th rib at the start of test; RIBFAT-WT = RIBFAT divided by BW; RUMPFAT-WT = RUMPFAT divided by BW; TEMP = deep rectal temperature; RTEMP = residual TEMP calculated by DMI; MPR = methane production rate; MY = methane yield; CPR = carbon dioxide production rate; HP = heat production; HP-WT = HP divided by TWT; HP-EBP = HP divided by empty body protein weight; RHP = residual heat production calculated from DMI.; RFIf = RFI measured in the feedlot.

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