亚群禽白血病病毒是一种主要感染肉用型鸡的反转录病毒。
Avian leukosis virus Subgroup J is a retro virus which infects meat-type chickens.
现在鸡的品种比祖传红原鸡体积要大并更具生产力，有四个基本类型：1）蛋鸡型或地中海型；（2）狩猎型；（3）肉用型及（4）矮脚型。
The present day chickens are larger and more productive than the ancestral Red Jungle Fowl with four basic types: 1) egg type, or Mediterranean; (2) game; (3) meat type; and (4) Bantam.
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