Candling Fertile Eggs

Candling Fertile Eggs

Candling eggs is the easiest way to check on the development of the chicks inside their eggs. By candling eggs through the incubation process it is possible to estimate the hatch rate well in advance of the hatch at 21 days.

Candling Fertile Eggs

The best time to candle eggs is at 14 days into the incubation period.  Trying to candle eggs without a proper egg candler is inaccurate and will not show the development of the embryo inside.  


For the most accurate results, eggs should be candled in a dark environment.  Candling can be used to check the fertility of eggs set under a hen or in an incubator.  Try to limit the time that the eggs spend unincubated to under five minutes.  Never candle eggs after the 17th day into the incubation process.


 To candle an egg, hold it up against the egg candler (also known as an egg tester or torch) with the largest round side of the egg facing the light beam produced by the candler.  It is a good idea to first candle an egg that has not been incubated to see how light travels straight through it.  When candling a fertile egg the light will be blocked by the developing embryo inside.  The development of membranes within the egg should also be clear.  


It is often possible to see movement within the egg at 14 days.  


Choosing the Right Egg Candler 



If you don't already own a high quality egg candler, then be sure to check out Poultry Australia's egg candlers.  All are guaranteed to provide the highest accuracy to eliminate the guesswork involved with other egg candlers.  

This image is of an egg that is not fertile using a FRD-10 egg candler. The high focus beam produced by the LED light beads travels striaght through the unfertilized egg.    FRD-10 egg candlers are sold exclusively in Australia by Poultry Australia and are available for $24.00 with $5.00 postage to your door.  Please visit our Egg Candlers page for further details.  


This image is of a fertile egg taken at 14 days into the incubation process.  The light does not travel all the way through the egg as it is blocked by the developing embryo inside.  A membrane structure can also be seen clearly at the base of the egg.