Goodwin M A, Davis J F, Brown J, Dickson T G
Georgia Poultry Laboratory, Oakwood 30566.
Avian Dis. 1992 Oct-Dec;36(4):1019-21.
The incidence of anemia in clinically ill Georgia broilers climbed from 66.4% (324/488) during 1988-89 to 80.9% (531/656) during 1990. The incidence of polycythemia fell from 1.6% (8/488) during 1988-89 to 1.5% (10/656) during 1990. Specifically, compared with 1988-89, the 1990 incidence of anemia increased significantly in chicks at age 7 days (P = 0.0002) and 28 days (P = 0.05). We have no certain explanation for this shifting incidence of anemia in clinically ill Georgia broilers. Anemic chicks have plasma that contains virus particles with morphologic characteristics consistent with a virus (chicken anemia agent [CAA]) known to cause anemia in chickens. If CAA is the predominant etiology for anemia in clinically ill Georgia broilers, then our observation could be easily explained. The increasing rate of anemia could indicate a decline in broiler health over time.
临床患病的佐治亚肉鸡贫血发病率从1988 - 1989年的66.4%（324/488）攀升至1990年的80.9%（531/656）。红细胞增多症的发病率从1988 - 1989年的1.6%（8/488）降至1990年的1.5%（10/656）。具体而言，与1988 - 1989年相比，1990年7日龄雏鸡（P = 0.0002）和28日龄雏鸡（P = 0.05）的贫血发病率显著增加。对于临床患病的佐治亚肉鸡贫血发病率的这种变化，我们尚无确切解释。贫血雏鸡的血浆中含有病毒颗粒，其形态特征与一种已知可导致鸡贫血的病毒（鸡贫血因子[CAA]）一致。如果CAA是临床患病的佐治亚肉鸡贫血的主要病因，那么我们的观察结果就很容易解释了。贫血发病率的上升可能表明随着时间推移肉鸡健康状况下降。
