Table 5 Estimates of variance components and genetic parameters for birth weight (the best model is shown in bold).

Model	\(\:{\sigma\:}_{a}^{2}\)	\(\:{\sigma\:}_{d}^{2}\)	\(\:{\sigma\:}_{c}^{2}\)	\(\:{\sigma\:}_{m}^{2}\)	\(\:{\sigma\:}_{a.m}\)	\(\:{\sigma\:}_{e}^{2}\)	\(\:{\sigma\:}_{p}^{2}\)	\(\:{h}_{a}^{2}\)	\(\:{h}_{d}^{2}\)	\(\:{h}_{c}^{2}\)	\(\:{h}_{m}^{2}\)	e²	r_{a, m}	AIC
1	0.196					0.348	0.544	0.36 ± 0.03				0.64 ± 0.03		1068.69
2	0.194	0.191				0.162	0.548	0.35 ± 0.03	0.35 ± 0.06			0.30 ± 0.07		1054.69
3	0.052		0.112			0.347	0.511	0.10 ± 0.02				0.68 ± 0.02		911.59
4	0.050	0.147	0.111			0.205	0.514	0.10 ± 0.03	0.29 ± 0.06			0.39 ± 0.06		901.60
5	0.023			0.155		0.368	0.547	0.04 ± 0.01		0.22 ± 0.02	0.28 ± 0.02	0.67 ± 0.02		914.01
6	0.022	0.159		0.153		0.214	0.550	0.04 ± 0.01	0.29 ± 0.06	0.22 ± 0.02	0.28 ± 0.02	0.39 ± 0.06		902.16
7	0.021			0.138	0.035	0.370	0.549	0.04 ± 0.01			0.25 ± 0.02	0.67 ± 0.02	0.35 ± 0.19	913.63
8	0.020	0.160		0.136	0.019	0.215	0.551	0.04 ± 0.02	0.29 ± 0.06		0.24 ± 0.02	0.39 ± 0.05	0.37 ± 0.19	901.70
9	0.027		0.068	0.061		0.359	0.517	0.05 ± 0.02		0.13 ± 0.02	0.11 ± 0.02	0.69 ± 0.02		894.67
10	0.026	0.151	0.066	0.062		0.213	0.520	0.05 ± 0.01	0.30 ± 0.06	0.13 ± 0.02	0.12 ± 0.02	0.41 ± 0.06		883.96
11	0.024		0.067	0.048	0.017	0.361	0.519	0.05 ± 0.01		0.13 ± 0.02	0.09 ± 0.02	0.70 ± 0.01	0.49 ± 0.22	893.42
12	0.023	0.152	0.065	0.049	0.017	0.214	0.514	0.05 ± 0.01	0.29 ± 0.06	0.13 ± 0.02	0.09 ± 0.02	0.41 ± 0.03	0.50 ± 0.22	882.64

\(\:{\sigma\:}_{a}^{2}\)= additive genetic variance;\(\:\:{\sigma\:}_{d}^{2}\)= dominance genetic variance;\(\:\:{\sigma\:}_{c}^{2}\)= maternal permanent environmental variance;\(\:\:{\sigma\:}_{m}^{2}\)= maternal genetic variance; \(\:{\sigma\:}_{a.m}\)= direct-maternal additive genetic covariance; \(\:{\sigma\:}_{e}^{2}\)= residual variance; \(\:{\sigma\:}_{p}^{2}\)= phenotypic variance;\(\:\:{h}_{a}^{2}\)= additive heritability; \(\:{h}_{d}^{2}\)= dominance heritability; \(\:\:{h}_{c}^{2}\)= maternal permanent environmental effect, \(\:{h}_{m}^{2}\)= maternal heritability; e²: ratio of residual variance to phenotypic variance; r_{a, m}= direct-maternal additive genetic correlation; AIC= Akaike’s information criterion.

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