Theriogenology: Prolactin secretion and ovarian function in cycling and non-cycling African female elephants (Loxodonta africana)

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  • YAMAMOTO Yuki
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • YAMAMOTO Tatsuya
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • WATANABE Gen
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • YUTO Natsuki
    Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • KEIO Megumi
    Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • NARUSHIMA Etsuo
    Tama Zoological Park
  • KATAYANAGI Masayuki
    Tama Zoological Park
  • NAKAO Risa
    Tama Zoological Park
  • MORIKUBO Syu
    Tama Zoological Park
  • SAKURAI Yuko
    Tama Zoological Park
  • KANEKO Mikako
    Tama Zoological Park
  • KAEWMANEE Saroch
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • TAYA Kazuyoshi
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology

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タイトル別名
  • Prolactin Secretion and Ovarian Function in Cycling and Non-Cycling African Female Elephants (Loxodonta africana)

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Reproduction of captive elephants in zoos has shown a low fecundity and requires improvement. One of the reasons for low fecundity is ovarian dysfunction in many female elephants. To investigate whether prolactin has a correlation with ovarian function in female elephants, the serum concentrations of prolactin, progesterone and estradiol-17β in four African female elephants (one cycling female and three non-cycling female elephants) were measured. Cyclic patterns of prolactin and estradiol-17β were observed in the cycling female elephant, which tended to be high during the follicular phase and low during the luteal phase. On the other hand, a cyclic pattern of prolactin was not observed in the non-cycling female elephants. One of the three non-cycling females (Mako) had developed breasts and showed significantly higher average levels of prolactin than the other female elephants. These results suggested that high concentrations of circulating estradiol-17β during the follicular phase stimulated prolactin secretion. They also suggested that hyperprolactinemia in Mako was one of the causes of the developed mammary glands and ovarian dysfunction.<br>

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