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Table 4 Means (±SD) for growth, feed efficiency, and metabolizable efficiency traits compared between the high- and low-RFI broiler chickens1

From: New insights into the associations among feed efficiency, metabolizable efficiency traits and related QTL regions in broiler chickens

Traits2 Low-RFI High-RFI Low-RFI /High-RFI, %3
RFI, g/d −7.52 ± 2.71 8.17 ± 3.31** − 192.04
FCR, g:g 1.81 ± 0.06 1.99 ± 0.08** −9.05
ADFI, g/d 161.39 ± 13.13 175.02 ± 14.33** −7.79
BW28, g 1261.39 ± 112.43 1245.28 ± 81.29 1.29
BW42, g 2513.06 ± 174.62 2481.94 ± 166.53 1.25
ADG, g/d 89.40 ± 7.31 88.33 ± 9.53 1.21
DEW, g/d 38.63 ± 3.26 42.78 ± 4.04** −9.70
GEE, kcal/d 148.96 ± 12.91 162.95 ± 15.29** −8.59
CPE, g/d 11.10 ± 1.19 12.92 ± 1.40** −14.09
MDM, g/d 99.74 ± 8.31 107.28 ± 8.53** −7.03
AMEn, kcal/d 431.56 ± 35.86 467.73 ± 37.64** −7.73
MCP, g/d 18.00 ± 1.43 18.64 ± 1.51 −3.43
Coefficient of MDM, % 72.11 ± 0.86** 71.52 ± 0.89 0.82
Coefficient of AMEn, % 71.44 ± 0.80 71.40 ± 0.73 0.06
Coefficient of MCP, % 61.97 ± 1.93** 59.17 ± 2.21 4.73
AbF, g 27.03 ± 9.5 33.36 ± 11.4* −18.97
AbP, % 1.06 ± 0.34 1.34 ± 0.43** −20.90
  1. 1low-RFI from male broilers with the 20% lowest RFI, n = 36 and high-RFI with the 20% highest RFI, n = 36; *P < 0.05, **P < 0.01
  2. 2RFI residual feed intake; FCR feed conversion ratio; ADFI average daily feed intake; BW28 body weight at 28 d of age; BW42 body weight at 42 d of age; ADG average daily gain; DEW dry excreta weight; GEE gross energy excretion; CPE, crude protein excretion; MDM metabolizable dry matter; AMEn nitrogen corrected apparent metabolizable energy; MCP metabolizable crude protein; AbF weight of abdominal fat; AbP percentage of abdominal fat
  3. 3Relative difference between low-RFI and high-RFI calculated as 100×(low-RFI mean/high-RFI mean − 1)