The subject was surveyed on capacity of growth of Ho chicken (Ho town, Thuan Thanh district, Bac Ninh province) and Mia chicken (Duong Lam village, Son Tay town, Ha Noi city), the results showed that: the body weight of Ho chicken on 20 age week is 2123,68-2285,56 gram/chicken for cock and is 1713,33-1786,57 gram/chicken for hen
the body weight of Mia chicken on 20 age week is 1916,26-2087,86 gram/chicken for cock and is 1704,26-1808,67 gram/chicken for hen. The subject analyse the varyety of gen cytochrome b of Ho and Mia chicken by 4 limited enzyme HincII, HhaI, NcoI and SaII. The limited enzyme have a same of cutting point on gen cytochrome b: the cutting point of enzyme HincII maked two bands with size 520bp and 680bp, the cuting point of enzyme HhaI maked two bands with size 400bp and 800bp, the cutting, point of enzyme Ncol maked two bands with size 540bp and 660bp, the cutting point of enzyme SaII maked two bands with size 530bp and 670bp.