Barr B C, Murphy C J, Ghazikhanian G Y, Bellhorn R W
California Veterinary Diagnostic Laboratory System, University of California, Davis 95616.
Avian Dis. 1988 Jul-Sep;32(3):469-77.
Newly hatched commercial turkey poults culled because of grossly visible cataracts were studied. A total of 43 affected and 23 unaffected control poults at various ages were necropsied, and the ocular changes in affected poults were compared with those of aged-matched controls. Affected poults had consistent cataracts coupled with a marked depletion in retinal inner plexiform, ganglion cell, and optic nerve fiber layers, with a resultant reduction in the size of the optic nerves. Lesions were seen in 1-day-old poults. Lens changes included microphakia and lens fiber degeneration throughout the lens, with nuclear liquefaction. The depletion in the numbers of retinal ganglion cells did not appear to progress over several weeks time. The ganglion cell depletion was not uniform within the retina. The cause for these ocular changes is unknown.
对因明显可见的白内障而被淘汰的新孵化商业火鸡雏进行了研究。对43只受影响和23只未受影响的不同年龄对照雏进行了尸检，并将受影响雏的眼部变化与年龄匹配的对照雏进行了比较。受影响的雏有一致的白内障，同时视网膜内网状层、神经节细胞层和视神经纤维层明显变薄，导致视神经尺寸减小。在1日龄的雏中可见病变。晶状体变化包括小晶状体和整个晶状体的晶状体纤维变性以及核液化。视网膜神经节细胞数量的减少在几周内似乎没有进展。神经节细胞的减少在视网膜内并不均匀。这些眼部变化的原因尚不清楚。
