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NOVEL LIGHTING SYSTEMS STIMULATING GONADAL DEVELOPMENT AND EXPEDITING SEXUAL MATURITY OF MALE AND FEMALE CHICKENS

  • Umeda, I. (Mugi Regional Office of Gifu Prefectural Government Office) ;
  • Hayakawa, H. (Gifu Prefectural Government Office) ;
  • Kamiya, S. (Department of Animal Science and Technology Faculty of Agriculture, Gifu University) ;
  • Tanabe, Y. (Azabu University School of Veterinary Medicine)
  • Received : 1992.07.29
  • Accepted : 1992.11.09
  • Published : 1993.03.01

Abstract

Ten-week-old White Leghorn immature males and females were exposed to four lighting regimens: a constant light (12L : 12D); repeated up and slow down (13 min. up and 1 min. down per day for 13 consecutive days, and repeated on two-week cycle) lighting; repeated slow up and down (1 min. up per day for 13 consecutive days and 13 min. down, and repeated on two-week cycle) lighting; and step-up (14 min. up every second week) lighting. At 15 weeks of age, significantly larger testis and comb weights and significantly higher concentrations of plasma LH and testosterone were observed in the cockerels under the repeated slow up and down lighting regimen than those under the other lighting regimens. At 20 weeks of age, significantly larger oviduct weights and significantly higher concentrations of plasma estradiol were observed in the pullets under the repeated up and slow down, and the step-up lighting regimens than those under the other lighting regimens.