1 136 sequences of the cyt b gene in full length for 18 cattle breeds spanned 1140 bp, started with an ATG codon and ended with an AGA codon. No insertion/deletion or length variation was observed in these sequences.

• 1 18个品种136个个体的mtDNA cyt b基因全序列不存在长度差异(1140 bp),均以ATG为起始密码子,中间无插入、缺失或终止密码子,以终止密码子AGA结束。