Sex identification is performed in our laboratory using genomic DNA isolated from nucleated blood cells. The test distinguishes between males and females based on a difference in their chromo-helicase DNA binding genes (CHD). The CHD genes of different genders vary in size and base sequences. Thus females, which have both the CHD-Z and CHD-W forms of the gene, can be distinguished from males, which only have the CDH-Z form. This genetic dimorphism is consistent in psittacines, waterfowl, and most raptors. It does not exist, however, in ratites and consequently we cannot sex ratites with this technique.
For more information on Genetic Bird Sexing visit DLS Test Information and Pricing.