title: The effects of ahemeral light and dark cycles on growth and sexual maturity in chickens.
abstract: Replacement pullets were reared in environmentally controlled chambers in which the lighting schedule was 14L:7D, 14L:10D or 14L:14D. Both temperature and humidity were constant throughout the experiment. Neither body weight nor age at sexual maturity were altered by these lighting schedules. It was concluded that a unifying hypothesis to explain the various effects of photoperiods on growth and sexual maturity would probably not involve circadian rhythms.
mesh_terms: D000818:Animals; D002645:Chickens / Q000254:growth & development*; D002940:Circadian Rhythm; D005260:Female; D008027:Light; D012741:Sexual Maturation