A method for the determination of the gender of bird embryos in bird eggs through the optically opaque eggshell, in which the genetic material in the germ disc to be analysed is clarified by electromagnetic spectral analysis, characterized in that - in a first step, the bird's egg is positioned under an array of pulse transmitters and receivers which are arranged in one plane and connected to a computer system for data and information transfer, wherein electromagnetic pulses in the spectral range from 0.01 to 1 THz are transmitted by the pulse transmitters through the optically opaque eggshell to the bird's egg, and simultaneously the radiation reflected by the bird's egg and passing the optically opaque eggshell is measured and transferred to the computer system via data and information transmission connections, wherein a reconstructed volume model of the bird's egg with 3D spatial coordinates (x,y,z) is created by the computer, and afterwards - in a second step, on the basis of the 3D spatial coordinates (x,y,z) determined in the first step, a positioning device robotically positons a broadband electromagnetic transmitter relative to a measurement area of the test object to be examined in such a way that electromagnetic waves in the spectral range from 0.01 to 10 THz are emitted through the optically opaque barrier to the measurement area of the previously positioned test object and the radiation emitted by the measurement area and passing through the optically opaque barrier is received by a spectral receiver and sent to the computer system via data and information transmission connections, wherein the integral spectrum of the measurement area recorded by the receiver is automatically analysed by a computer and compared with the data of a database of spectral material parameters which were previously obtained by laboratory measurements of the dielectric properties of samples of bird eggs in the relevant spectral range without optically opaque eggshells. - in a first step, the bird's egg is positioned under an array of pulse transmitters and receivers which are arranged in one plane and connected to a computer system for data and information transfer, wherein electromagnetic pulses in the spectral range from 0.01 to 1 THz are transmitted by the pulse transmitters through the optically opaque eggshell to the bird's egg, and simultaneously the radiation reflected by the bird's egg and passing the optically opaque eggshell is measured and transferred to the computer system via data and information transmission connections, wherein a reconstructed volume model of the bird's egg with 3D spatial coordinates (x,y,z) is created by the computer, and afterwards - in a second step, on the basis of the 3D spatial coordinates (x,y,z) determined in the first step, a positioning device robotically positons a broadband electromagnetic transmitter relative to a measurement area of the test object to be examined in such a way that electromagnetic waves in the spectral range from 0.01 to 10 THz are emitted through the optically opaque barrier to the measurement area of the previously positioned test object and the radiation emitted by the measurement area and passing through the optically opaque barrier is received by a spectral receiver and sent to the computer system via data and information transmission connections, wherein the integral spectrum of the measurement area recorded by the receiver is automatically analysed by a computer and compared with the data of a database of spectral material parameters which were previously obtained by laboratory measurements of the dielectric properties of samples of bird eggs in the relevant spectral range without optically opaque eggshells.