Maximum entropy method for the spectral analysis of secretory rhythms of plasma growth hormone and prolactin in cattle

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  • OGINO Mizuna
    Department of Animal Science, School of Veterinary Medicine, Kitasato University
  • MATSUURA Akihiro
    Department of Animal Science, School of Veterinary Medicine, Kitasato University
  • YAMAZAKI Atusi
    Department of Animal Science, School of Veterinary Medicine, Kitasato University
  • IRIMAJIRI Mami
    Department of Animal Science, School of Veterinary Medicine, Kitasato University
  • KUSHIBIKI Shiro
    National Institute of Livestock and Grassland Science
  • SHINGU Hiroyuki
    National Institute of Livestock and Grassland Science
  • KASUYA Etsuko
    National Institute of Agrobiological Sciences
  • HODATE Koichi
    Department of Animal Science, School of Veterinary Medicine, Kitasato University

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Other Title
  • パワースペクトル解析（最大エントロピー法）による牛血漿中成長ホルモンおよびプロラクチン分泌リズム解析方法の検討
  • パワースペクトル カイセキ(サイダイ エントロピーホウ)ニ ヨル ギュウ ケッショウ チュウ セイチョウ ホルモン オヨビ プロラクチン ブンピ リズム カイセキ ホウホウ ノ ケントウ

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Abstract

We investigated secretory rhythms of the plasma growth hormone (GH) and prolactin (PRL) in cattle by spectral analysis using the maximum entropy method (MEM). MEM is considered more useful than the fast Fourier transform (FFT) and Cosinor methods because MEM can yield results of high spectral resolution, with high precision and analytical capability from short-period data. However, few challenges are faced in performing spectral analysis by MEM with regard to sampling interval and lag. Cyclic rhythms (hours) of hormone secretion in cattle determined by MEM under different conditions of sampling interval and lag within different seasons were compared. For hormones such as GH and PRL that exhibit both short-period (ultradian) and long-period (circadian) secretory rhythms, MEM was found to be the best method for sampling by short-time interval, for example, 15 min and in addition, increasing the lag number made the detection of both short- and long- period rhythms possible. However, the analysis of 30-min interval sampling data yielded a result similar to that of 15-min interval data. Therefore, for the investigation of secretory pattern with longer than 15-h rhythm, consecutive sampling of longer than 30 h is needed.

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