Table 1.

Descriptive statistics of variables on pig growth performance and dietary nutrient concentrations used in developing the prediction models¹

Variables	Training data set						Testing data set
	Unit	n	Range	Mean	SD	Median	n	Range	Mean	SD	Median
BW	kg	287	5.5-118.6	45.6	36.7	37.0	119	5.6-116.1	41.8	33.2	35.8
ADG	g/d	287	142-1200	634	268	697	119	165-1060	647	252	680
ADFI	g/d	287	259-3667	1600	1058	1550	119	269-3575	1543	974	1450
F/G	-	287	1.16-4.35	2.26	0.82	2.08	119	1.21-3.85	2.17	0.72	1.97
NE intake	kcal/d	287	602-9906	4168	2790	3958	119	719-9415	4015	2573	3687
CP intake	g/d	287	40-646	242	143	224	119	58-684	244	138	232
SID Lys intake	g/d	287	3.30-57.74	14.20	7.66	14.61	119	4.13-32.19	14.27	6.64	13.75
SID Met intake	g/d	287	0.68-23.07	5.46	3.05	5.16	119	1.12-18.55	5.51	3.00	4.83
SID Thr intake	g/d	287	1.13-24.05	8.49	4.64	9.29	119	1.99-23.26	8.52	4.50	7.66
SID Try intake	g/d	287	0.27-10.75	2.47	1.39	2.53	119	0.56-7.54	2.49	1.28	2.24
SID Val intake	g/d	287	1.58-27.84	10.49	5.98	10.85	119	2.52-27.96	10.55	5.71	9.73
ADF intake	g/d	287	4-240	55	42	55	119	4-247	56	43	49
NDF intake	g/d	287	15-604	185	135	176	119	15-431	177	120	164

ADF acid detergent fiber, ADFI average daily feed intake, ADG average daily gain, BW body weight, CP crude protein, F/G feed conversion ratio, NDF neutral detergent fiber, NE net energy, SD standard deviation, SID standardized ileal digestible.

¹ Data were collected from 72 peer-reviewed articles published from 2009-2019 with 406 treatment means. All the dietary nutrient concentrations were re-calculated based on reported diet formulations in the peer-reviewed articles and the nutrient compositions of ingredients published in Nutrient Requirements of Swine in China [13].