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

Table 2 Descriptive statistics for growth, feed efficiency, and metabolizable efficiency traits of broilers

Traits¹	N	Mean	SD	Min	Max	CV, %
RFI, g/d	180	0.00	5.69	−16.72	17.03	–
FCR, g:g	180	1.89	0.09	1.62	2.23	4.59
ADFI, g/d	180	167.95	14.46	119.07	198.36	8.61
BW28, g	180	1254.67	91.02	970.00	1530.00	7.25
BW42, g	180	2499.08	166.43	2020.00	2855.00	6.66
ADG, g/d	180	88.89	8.55	61.43	107.86	9.61
DEW, g/d	180	40.65	3.84	29.24	50.20	9.45
GEE, kcal/d	180	155.63	14.84	110.07	196.19	9.54
CPE, g/d	180	11.90	1.40	8.33	16.41	11.78
MDM, g/d	180	103.35	9.04	72.84	123.29	8.75
AMEn, kcal/d	180	448.94	39.37	317.20	532.27	8.77
MCP, g/d	180	18.38	1.64	12.84	22.82	8.91
Coefficient of MDM, %	180	71.80	1.09	68.67	75.71	1.52
Coefficient of AMEn, %	180	71.42	0.97	68.34	74.57	1.36
Coefficient of MCP, %	180	60.81	2.57	53.15	67.12	4.23
AbF, g	180	30.66	10.41	7.70	61.90	33.96
AbP, %	180	1.22	0.39	0.38	2.27	32.12

¹RFI 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; CV coefficient of variation

ISSN: 2049-1891