1. Daily; circadian; cyclical, with a period of 24 hours
    • 2003, Robinson, Frank Edwin; Fasenko, Gaylene Marie; Robert Allen Renema New Developments in Reproduction and Incubation of Broiler Chickens, page 116
      Photostimulation at 22 weeks of age was done with either a normal, hemeral day (14 hours of light; 10 hours of darkness) or a long ahemeral day (14 hours of light; 14 hours of darkness).
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