Genomic DNA from blood was extracted to identify the sex of the embryo. Amplification was performed using CHD1 specific primers (CHD1-F: CTGCGAGAACGTGGCAACAGAGT; CHD1-R: ATTGAAATGATCCAGTGCTTG). The results showed that the hereditary female (ZW) had two strips at 580 and 423 bp, while the hereditary male (ZZ) had only one strip at 580 bp.
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