Post-weaning HF diet significantly downregulated mRNA level of most clock and clock-controlled genes in the males (All Ppost < 0.05), with the exception of Cry1 and Cry2. In females, post-weaning HF diet led to the downregulation of the Baml, Ck1e, Cry1, and Per1. The gene discussed is PER1; the disease is hydrops fetalis.