Table 4 Estimation of regression equations of the market-weight at 70 days-old chicken (Y) on the chick weights at 1 day-, 14 days-, 28 days-, 42 days-, and 56 days-old (X) for 13 strains of Korean native chickens

Independent variables (X)	Female	Male	Overall
Body weight at 1 d	Y=6.4340*X+1559.0 (R2=0.0110)	Y=10.423**X+1728.7 (R2=0.0166)	Y=10.118**X+1550.5 (R2=0.0139)
Body weight at 14 d	Y=1.8133**X+1495.9 (R2=0.0692)	Y=1.3887**X+1893.8 (R2=0.0273)	Y=2.3222**X+1538.3 (R2=0.0635)
Body weight at 28 d	Y=1.8294**X+894.76 (R2=0.3127)	Y=1.4012**X+1375.2 (R2=0.1384)	Y=2.2265**X+788.49 (R2=0.305)
Body weight at 42 d	Y=1.3921**X+496.77 (R2=0.4885)	Y=1.5278**X+473.22 (R2=0.4221)	Y=1.7019**X+236.10 (R2=0.6039)
Body weight at 56 d	Y=1.2193**X+110.88 (R2=0.6853)	Y=1.2792**X+120.48 (R2=0.6499)	Y=1.3910**X—98.974 (R2=0.754)

The asterisk indicates the significance of the regression coefficient (^* P<0.05, ^** P<0.01).