• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

The analysis of seasonality of stress-tolerance as indicators of testicular weight and body weight.

Research Project

Project/Area Number 11610076
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 実験系心理学
Research InstitutionShiga University

Principal Investigator

IBUKA Nobuo  Shiga University, Faculty of Education, Prof., 教育学部, 教授 (70110757)

Project Period (FY) 1999 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2002: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordsseasonality / stress-tolerance / photoperiod / enriched environment / Syrian hamster / testis / body weight / 体重発達 / ストレス / 生育環境 / 精巣発達 / 老齢 / 体重 / 冬眠 / 光周性
Research Abstract

A series of experiments were conducted to investigate the effects of stress coming from unpredictable food deprivation in Syrian hamsters under various experimental situations. In Exp.1 one group was exposed to decreasing photoperiod while the other group was exposed to increasing photoperiod from a neutral one when the animals were deprived of food at random on 50% days over the 12 weeks. The results clearly showed that unpredictable deprivation of food induced more detrimental effects on testicular weight and body weight under decreasing photoperiodic situation than increasing one. In other words stress-tolerance was weaker in autumlike photoperiodic situation than springlike one. In Exp.2 we have proposed the hypothesis that enriched environment will alleviate stress coming from unpredictable deprivation of food. Thus the animals living in the enriched environment show stronger tolerance for the stress than the ones in the conventional living environment. The enriched environment wa … More s produced in the cage by the introduction of such toys as activity wheel, L-shaped tunnel and ladder. The results showed that the testicular weight and body weight were heavier for the animals raised in the enriched environment than the ones in the conventional cages. The results also indicated that the detrimental effect of the development of testis and body weight was weaker for the animals in the enriched environment than the ones in the conventional environment when food was deprived at random over 12 weeks. That is, the stress tolerance was stronger for the animals raised in the enriched environment than in the conventional living condition. The working hypothesis was supported by these data. In Exp.3 we investigated the prior photoperiodic history in the LP → LP (LD18 : 6 → LD14 : 10)and LP → SP(LD14 : 10 → LD10 : 10) light regime on testicular weight and body weight. The decrease of photopeirod was the same 4 hours for the two situations. When food was deprived on 50% days over 12 weeks under the 2nd photoperiod, the testicular weight and body weight were more suppressed in the latter light regime than in the former one. The results showed that not the amount of decrease of the photoperiod but the transfer from LP to SP including the critical photoperiod is important for the detrimental effect of the development of testtis and body weight. Less

Report

(5 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 加藤知歩, 井深信男: "シリアンハムスターの精巣変量に見られるストレス耐性の光周期操作による季節性"動物心理学研究. 52. 67-71 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 井深信男: "生体リズムとしての睡眠-特集に寄せて-"生理心理学と精神生理学. 18. 1-2 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 井深信男: "冬眠研究の最近の話題-睡眠ホメオスタシス仮説の展開-"日本時間生物学会会誌. 7. 3-12 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Terada, A., Ibuka, N.: "Age affects hibernation in Syrian hamsters"Chronobiology International. 17. 623-630 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 井深信男: "「冬眠する哺乳類」川道, 近藤, 森田(編),分担執筆"東京大学出版会. 316-326 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Chiho Kato and Nobuo Ibuka: "Stress tolerance in testes weight of Syrian hamsters varies with season by photoperiodic change(in Japanese)"The Japanese Journal of Animal Psychology. 52. 67-71 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nobuo lbuka: "A topics on hibernation-The development of sleep homeostasis hypothesis-(in Japanese)"The Nihon Jikanseibutsu Gakkaishi(The official Journal of Japanese Society of Chronobiology). 7. 3-12 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nobuo Ibuka: "Sleep as biological rhythm-a foreword to a special issue-(in Japanese)"The Japanese Journal of Physiological Psychology and Psychophysiology. 18. 1-2 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Terada Atsushi and Nobuo Ibuka: "Age affects hibernation in Syrian hamsters (Mesocricetus auratus)"Chronobiology International. 17. 623-630 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 加藤知歩, 井深信男: "シリアンハムスターの精巣重量に見られるストレス耐性の光周期操作による季節性"動物心理学研究. 52(2). 67-71 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 井深 信男: "生体リズムとしての睡眠-特集に寄せて-"生理心理学と精神生理学. 18. 1-2 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 井深 信男: "冬眠研究の最近の話題-睡眠ホメオスタシス仮説の展開"日本時間生物学会会誌. 7. 3-12 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 井深信男: "「冬眠する哺乳類」川道・近藤・森田(編)分担"東京大学出版会. 316-326 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Terada, A., & Ibuka, N.: "Age Effect hibernation in the Syrian hamsters (Mesocricetirs accratus)"Chronobiology Intenacional. 17(5). 623-630 (2000)

    • Related Report
      2000 Annual Research Report

URL: 

Published: 1999-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi