Eggshell apex abnormalities associated with Mycoplasma synoviae infection in layers
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Published on: February 20, 2015
Eun-Ok Jeon1, Jong-Nyeo Kim, Hae-Rim Lee
1Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju 361-763, Korea.
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.
Insights
Mycoplasma synoviae (MS) infection in poultry causes significant eggshell apex abnormalities (EAA), affecting shell strength and ultrastructure. Affected eggs show lasting damage, even if appearing normal externally.
Area of Science:
- Poultry Science
- Animal Pathology
- Veterinary Medicine
Background:
- Eggshell apex abnormalities (EAA) can impact poultry production.
- Mycoplasma synoviae (MS) is a known poultry pathogen.
Observation:
- Eggs with EAA were assessed for shell strength, thickness, and ultrastructure.
- Mycoplasma synoviae (MS) infection was confirmed via serological assays and isolation from the reproductive tract.
- Scanning Electron Microscopy was used to examine shell ultrastructure.
Findings:
- MS infection led to statistically significant changes (p < 0.01) in eggshell quality.
- Ultrastructural alterations were observed in the mammillary knob layer of affected eggs.
- Even eggs that appear structurally intact exhibit sub-optimal quality upon ultrastructural evaluation.
Implications:
- This study is the first to report EAA in Korea.
- MS infection negatively impacts eggshell integrity beyond visible parameters.
- Findings highlight the need for disease control to maintain egg quality.
