WHAT YOU NEED TO KNOW ON CANDLING AN EGG

Candling of eggs should be done on the 7th and 14th day of incubation. On the 7th day, clear eggs indicate infertility, red blood vessels (resemble tree branches) indicate fertile eggs while red or black staining and blood rings indicate early death at this point.

On the 14th day, eggs that are three-quarters completely dark from the narrow end and a quarter clear at the broad end (air sac space) indicate that the embryo is developing while a dark outline with ill-defined detail indicates late death of the embryo.

Refrain from candling after day 16 as the eggs should not be moved or turned days prior to hatching. The candling equipment usually looks like a small flashlight powered by either batteries or plug-in cord and can be sourced from incubator suppliers. 

Credit: Facebook | Dr Fami