The present invention relates to a method for analyzing and/or treating a fertilized egg and a system able to implement said method. According to the invention, the method comprises a step of puncturing and/or injecting substance into the albumin sac of the egg, said egg having between 5 and 19 days of incubation and said step of puncturing and/or injecting being achieved by piercing a hole in the shell next to the pointed end of the egg and passing a hollow needle in said hole such as to lead the distal end of said needle into the albumin sac.
