Table 5.

Likelihood ratios and χ2 test results of different model comparisons.

Model comparison	df	BWT	WWT	ADG	KR
1:2	1	229.14***	23.68***	62.42***	48.64***
1:3	1	124.1***	21.74***	63.52***	41.08***
1:4	2	133.48***	37.57***	75.14***	41.08***
1:5	2	232.5***	39.62***	83.54***	56.16***
1:6	3	240.32***	51.34***	93.44***	56.24***
2:5	1	3.36 ns	15.94***	11.82***	7.52***
2:6	2	11.18**	27.66***	21.12***	7.60*
3:4	1	9.38**	15.83***	11.62***	0.00 ns
3:5	1	108.4***	17.88***	20.02***	15.08***
3:6	2	116.22***	29.60**	29.92***	15.16***
4:6	1	106.84***	13.77***	18.30***	15.16***
5:6	1	7.82**	11.72***	9.90**	0.08 ns

BWT, birth weight; ADG, average daily gain from birth to weaning; WWT, weaning weight; KR, Kleiber ratio (ADG/WWT^0.75) from birth to weaning;

^***P < 0.001;

^**P < 0.01;

^*P < 0.05;

^ns:P > 0.05.