To obtain maximum hatchability from the hatching eggs, high fertility is essential. And to obtain maximum hatchability from the fertile hatching eggs, the following key points on the farm have to be taken into consideration.
- Frequent egg collection
Collect the eggs frequently from the nests, especially in warm conditions. Temperatures above 25o - 26oCwill result in pre-incubation, which is detrimental for embryo viability.
- Egg cooling
Allow eggs to cool to the correct temperature before stacking and packing. If eggs are either too warm or too cold before packing, they will maintain that temperature for a long period, with consequent negative influence on embryo viability.
- Storage temperatures
The correct egg storage temperature varies with the length of the storage period.
storage for 2-4 days: 20-21oC
storage for 4-7 days: 18-19oC
storage for 7-10 days: 15-16oC
storage beyond 10 days: 14-15oC
Setting eggs within 2 days is not recommended
- Storage times
On the average, hatchability declines after 7 days of storage which is even quicker for eggs from older flocks. Setting within a week, preferably within 5 days, is therefore recommended.
- Condensation
Avoid condensation (sweating) of eggs as it increases bacterial contamination. If eggs are transferred from cold to warm conditions, always pay attention to dewpoint temperatures. If a dewpoint can be expected, warm up the eggs gradually, to avoid condensation. Make sure egg storage temperature at the farm, during transportation and at the hatchery, are adjusted to each other thus preventing condensation.
- Egg quality
Make sure egg quality is at high level by preventing dirty eggs and bad shell quality. If these eggs are produced, mark them carefully so they can be treated separately.
- First grade eggs
Separate first grade eggs from second grade eggs and mark them carefullly, so they can be treated separately at the hatchery.
- Fumigation
Fumigate eggs as quickly as possible to stop bacterial contamination and to avoid cross-contamination.
