title: Eggshell apex abnormalities associated with Mycoplasma synoviae infection in layers.
abstract: Eggs exhibiting eggshell apex abnormalities (EAA) were evaluated for changes in shell characteristics such as strength, thickness, and ultrastructure. Mycoplasma synoviae (MS) infection was confirmed by serological assay along with isolation of MS from the trachea and oviduct. Changes in eggshell quality were shown to be statistically significant (p < 0.01). We also identified ultrastructural changes in the mammillary knob layer by Scanning Electron Microscopy. While eggs may seem to be structurally sound, ultrastructural evaluation showed that affected eggs do not regain their former quality. In our knowledge, this is the first report describing the occurrence of EAA in Korea.
authors: Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju 361-763, Korea.
authors: Eun-Ok
authors: EO
authors: Jeon
authors: Jong-Nyeo
authors: JN
authors: Kim
authors: Hae-Rim
authors: HR
authors: Lee
authors: Bon-Sang
authors: BS
authors: Koo
authors: Kyeong-Cheol
authors: KC
authors: Min
authors: Moo-Sung
authors: MS
authors: Han
authors: Seung-Baek
authors: SB
authors: Lee
authors: Yeon-Ji
authors: YJ
authors: Bae
authors: Jong-Suk
authors: JS
authors: Mo
authors: Sun-Hyung
authors: SH
authors: Cho
authors: Chang-Hee
authors: CH
authors: Lee
authors: In-Pil
authors: IP
authors: Mo
mesh_terms: D000818:Animals; D002645:Chickens; D004528:Egg Shell / Q000382:microbiology / Q000648:ultrastructure*; D008855:Microscopy, Electron, Scanning / Q000662:veterinary; D009175:Mycoplasma Infections / Q000382:microbiology / Q000662:veterinary*; D045805:Mycoplasma synoviae / Q000502:physiology*; D011201:Poultry Diseases / Q000382:microbiology*; D056910:Republic of Korea
keywords: Mycoplamsa synoviae; eggshell abnormalities; eggshell ultrastructure; scanning electron microscopy