Abstract: We sought to design a simple and rapid diagnostic kit for sex identification in chicks and embryos of Chinese gamecocks, using DNA extracted from chicks and embryos through non-invasive methods. This diagnostic process is based mainly on the amplification of intron length polymorphisms in chromo-helicase DNA-binding (CHD) genes in both Z and W chromosomes by Polymerase Chain Reaction (PCR). This approach offers some advantage over the old diagnostic method developed by Fridolfsson and Ellegren, in which one of the primers is mismatched to the chicken CHD-Z gene and it can additionally be used for the rapid sexing of chicks and embryos. In this study, we demonstrate that the improved method of sex identification is more stable than Fridolfssons and uses simple, non-invasive DNA extraction, to provide a rapid and inexpensive procedure for sexing chicks. We made successful application of this procedure for sexing chicken in two diagnostic cases. We further tested another pair of primers targeting chicken chromo-helicase-DNA binding (CHD) genes as well. And lastly, we used this technology to develop a PCR-based diagnostic kit with an internal control for the sex identification of gamecock chicks and embryos.
Wu-Yi Liu, Chun-Jiang Zhao and Jun-Ying Li, 2010. A Non-Invasive and Inexpensive PCR-Based Procedure for Rapid Sex Diagnosis of Chinese Gamecock Chicks and Embryos. Journal of Animal and Veterinary Advances, 9: 962-970.