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Microbial contamination of artificially incubated Greater Rhea (Rhea americana) eggs
M C Lábaque1, J L Navarro, M B Martella
1Centro de Zoologia Aplicada, Córdoba, Argentina. clabaque@com.uncor.edu
Abstract:
1. This paper is a report of biological agents that contaminate Greater Rhea (Rhea americana) eggs during artificial incubation. 2. The cleanliness of eggs when collected, and the period of storage prior to incubation, were investigated to assess their effects on microbial contamination and hatchability. 3. A total of 14 bacteria and 4 fungi species were isolated within the egg in the laboratory. 4. Microbial contamination was higher (24%) in very dirty eggs than in eggs which were clean or dirty (16%). Hatching success was lower (30%) for very dirty eggs, compared with 42% for clean or dirty eggs. 5. The percentage of microbial contamination of stored eggs (10%) did not differ significantly from that of non-stored ones (5%). 6. The extreme lower and upper limits of infection rate estimated for artificially incubated Greater Rhea eggs were 4% and 40%, respectively, being higher than in poultry species. 7. It is concluded that collecting eggs soon after laying will reduce the risk of microbial contamination.
Insights
Collecting dirty Greater Rhea eggs for artificial incubation increases microbial contamination and reduces hatching success. Prompt egg collection is crucial for minimizing contamination risks in Rhea americana incubation.
Area of Science:
- Avian biology
- Microbiology
- Hatchery management
Background:
- Artificial incubation of Greater Rhea (Rhea americana) eggs is susceptible to microbial contamination.
- Egg cleanliness and storage duration are critical factors influencing incubation success.
Purpose of the Study:
- To identify biological agents contaminating Greater Rhea eggs during artificial incubation.
- To assess the impact of egg cleanliness and storage on microbial contamination and hatchability.
Main Methods:
- Isolation and identification of bacterial and fungal species from Greater Rhea eggs.
- Correlation analysis between egg cleanliness, storage period, microbial load, and hatching rates.
Main Results:
- 14 bacterial and 4 fungal species were identified within the eggs.
- Very dirty eggs showed higher contamination (24%) and lower hatchability (30%) compared to clean/dirty eggs (16% contamination, 42% hatchability).
- Egg storage did not significantly affect microbial contamination rates (10% vs. 5%).
Conclusions:
- Egg cleanliness at collection is a primary factor influencing microbial contamination and hatchability in Greater Rhea.
- Prompt collection of freshly laid eggs is recommended to mitigate contamination risks.
- Infection rates in artificially incubated Greater Rhea eggs can be higher than in poultry species.
