TABLE 3.

Parameters of three growth curve models for linear body traits of generation 1 male and female Leizhou Black Ducks

Traits	Model	Gender	A	B	k	R 2	Inflection point growth	Inflection point
Body length	Logistic	Male	22.66	2.93	0.47	.98	11.33	2.31
		Female	21.42	2.85	0.52	.97	10.71	2.00
	Gompertz	Male	22.97	1.48	0.34	.99	8.45	1.13
		Female	21.63	1.46	0.39	.98	7.96	0.95
	Von Bertalanffy	Male	23.13	0.40	0.30	.99	6.85	0.57
		Female	21.74	0.39	0.35	.98	6.44	0.47
Chest width	Logistic	Male	8.17	3.71	0.30	.99	4.09	4.40
		Female	8.91	3.38	0.24	.99	4.45	5.18
	Gompertz	Male	8.68	1.70	0.19	.99	3.19	2.74
		Female	9.89	1.64	0.14	.99	3.64	3.46
	Von Bertalanffy	Male	9.01	0.45	0.16	.99	2.67	1.84
		Female	10.58	0.44	0.11	.99	3.14	2.42
Chest depth	Logistic	Male	8.56	3.54	0.23	.97	4.28	5.62
		Female	7.87	2.92	0.22	.97	3.94	4.80
	Gompertz	Male	9.56	1.70	0.14	.98	3.52	3.83
		Female	8.55	1.51	0.14	.98	3.15	2.90
	Von Bertalanffy	Male	10.20	0.45	0.11	.98	3.02	2.80
		Female	9.01	0.41	0.12	.98	2.67	1.80
Keel length	Logistic	Male	12.70	4.74	0.25	.98	6.35	6.25
		Female	11.56	4.04	0.26	.98	5.78	5.29
	Gompertz	Male	14.12	1.98	0.15	.98	5.19	4.60
		Female	12.53	1.81	0.17	.99	4.61	3.57
	Von Bertalanffy	Male	15.18	0.51	0.12	.98	4.50	3.61
		Female	13.20	0.47	0.13	.99	3.91	2.60
Pelvis width	Logistic	Male	4.59	6.36	0.84	.99	2.29	2.19
		Female	4.46	2.39	0.56	.99	2.23	1.55
	Gompertz	Male	4.64	2.33	0.58	.99	1.71	1.46
		Female	4.63	1.26	0.42	.99	1.70	0.55
	Von Bertalanffy	Male	4.64	2.33	0.58	1.00	0.29	0.47
		Female	4.65	0.35	0.37	.99	1.38	0.09
Shank length	Logistic	Male	6.99	2.17	0.39	.99	3.50	2.00
		Female	6.74	2.18	0.41	.99	3.37	1.89
	Gompertz	Male	7.11	1.21	0.29	.99	2.62	0.65
		Female	6.84	1.21	0.31	.99	2.52	0.61
	Von Bertalanffy	Male	7.18	0.34	0.25	.99	2.13	0.02
		Female	6.89	0.34	0.27	.99	2.04	0.02
Shank girth	Logistic	Male	3.48	2.52	0.81	.99	1.74	1.14
		Female	3.50	2.42	0.70	.99	1.75	1.27
	Gompertz	Male	3.50	1.28	0.60	.99	1.29	0.41
		Female	3.52	1.24	0.52	.98	1.29	0.42
	Von Bertalanffy	Male	3.51	0.35	0.54	.99	1.04	0.08
		Female	3.53	0.34	0.46	.98	1.05	0.04
Semi‐diving length	Logistic	Male	54.64	2.79	0.39	.99	27.32	2.64
		Female	50.84	2.68	0.43	.99	25.42	2.32
	Gompertz	Male	55.73	1.44	0.28	.99	20.50	1.29
		Female	51.72	1.41	0.31	.99	19.03	1.10
	Von Bertalanffy	Male	56.33	0.39	0.25	1.00	16.69	0.64
		Female	52.19	0.38	0.28	1.00	15.46	0.51
Neck length	Logistic	Male	23.46	4.00	0.36	.97	11.73	3.89
		Female	20.37	4.00	0.44	.96	10.19	3.17
	Gompertz	Male	24.2	1.83	0.25	.98	8.90	2.40
		Female	20.78	1.83	0.32	.98	7.64	1.92
	Von Bertalanffy	Male	24.64	0.48	0.22	.98	7.30	1.66
		Female	21.02	0.48	0.27	.98	6.23	1.32

R ², correlation coefficient.