(Key;
Laboratory;
of;
Animal;
Disease;
Control;
and;
Prevention;
of;
the;
Ministry;
of;
Agriculture,;
College;
of;
Veterinary;
Medicine,;
South;
China;
Agricultural;
University,;
Guangzhou;
510642,;
China);
J亚群禽白血病病毒; 全基因组测序; 血管; 全基因组序列; 酶联免疫吸附试验; ALV-J; 聚合酶链反应; gp85基因;