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It just means that someone bred the sex-links together. For example:
A RIR male x White Rhode Island gives you the first generation sex-link. The males from this crossing will be mainly white with red, while the females will be red with white.
A second generation is a sex-link (first generation) bred to another sex-link (first generation). This will give you the second generation. All offspring will (generally speaking) look alike. The sex-linking no longer applies because only the first generation was able to be sexed by the coloring.
They will be just as good at egg-laying as the first generation, but they are unable to be sexed based on color.
It just means that someone bred the sex-links together. For example:
A RIR male x White Rhode Island gives you the first generation sex-link. The males from this crossing will be mainly white with red, while the females will be red with white.
A second generation is a sex-link (first generation) bred to another sex-link (first generation). This will give you the second generation. All offspring will (generally speaking) look alike. The sex-linking no longer applies because only the first generation was able to be sexed by the coloring.
They will be just as good at egg-laying as the first generation, but they are unable to be sexed based on color.