TABLE 4.

Improvement of performance and genetic gain of HN-75 crossbred pigs over six generations through selection (Mean ± S.E.).

Parameter	First generation	Second generation	Third generation	Fourth generation	Fifth generation	Sixth generation	Overall genetic gain (%)	Average genetic gain/generation (%)
Litter size at birth (no.)	8.72 ± 0.75	8.79 ± 0.87	8.81 ± 1.04	8.98 ± 0.17	9.02 ± 1.21	9.12 ± 0.55	4.59	0.76
Litter size at weaning (no.)	8.05 ± 0.52	8.12 ± 0.87	8.25 ± 0.25	8.27 ± 0.73	8.37 ± 0.21	8.52 ± 0.81	5.84	0.97
Body weight at (kg)
Birth	0.83 ± 0.16	0.85 ± 0.25	0.87 ± 0.26	0.88 ± 0.16	0.89 ± 0.16	0.92 ± 0.06	10.84	1.81
Weaning	8.32 ± 0.34	8.63 ± 0.47	8.87 ± 0.48	9.05 ± 0.54	9.21 ± 0.87	9.46 ± 0.81	13.70	2.28
120 days	19.22 ± 0.52	19.98 ± 0.38	20.33 ± 0.49	20.43 ± 0.39	21.43 ± 0.58	23.63 ± 0.55	22.94	3.82
180 days	42.56 ± 0.79	43.54 ± 0.59	44.87 ± 0.62	45.16 ± 0.66	46.57 ± 0.57	47.13 ± 0.64	10.74	1.79
240 days	65.87 ± 0.67	65.69 ± 0.73	66.59 ± 0.58	67.20 ± 0.82	67.45 ± 0.78	68.11 ± 0.80	3.40	0.57
300 days	83.92 ± 0.67	83.79 ± 0.94	84.47 ± 0.87	85.21 ± 0.59	85.36 ± 0.67	86.48 ± 0.92	3.05	0.51

No. of observations is 240 for production traits and 30 for reproduction traits.