The incubation process is a complex process, that starting from the egg embryo, will create a beautiful bird, that initially inside the egg will go, for 14 days (in the canaries), to grow to break the egg peel and to emerge. In this process two problems can happen:

• The Clear eggs;
• The Embryonic death;
• The Clear Eggs.

The designation of clear eggs means eggs that are not fecundated. This situation happens a lot of times in the first canaries posture due to a delay of the males in the fertile season. This will take to a situation that the males doesn't fecundate the females that however already began the posture.
This situation can also happen due to a sterility of one of the couple's birds.
The delay of the males at that fertile season can be originated by E-vitamin lack. This way, and to solve the situation it should be administered 2 to 3 weeks before the mating E-vitamin as well as during all the breeding season.