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The Effect of Drip Cooling System on Reproductive Performance of Boars Exposed to Heat Srtess

Research Project

Project/Area Number 01480098
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 畜産学(含草地学)
Research InstitutionAzabu University

Principal Investigator

YOSHIMOTO Tadashi  Azabu Univ. School of Vet. Med. Professor, 獣医学部, 教授 (70009546)

Co-Investigator(Kenkyū-buntansha) TANIDA Hajime  School of Vet. Med. Assistante Professor, 獣医学部, 講師 (20197528)
TANAKA Toshio  School of vet. Med. Associate Professor, 獣医学部, 助教授 (40130893)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 1990: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1989: ¥5,800,000 (Direct Cost: ¥5,800,000)
KeywordsSummer sterility / Management of boars / Elevated ambient temperature / Skin temperature / Partial body cooling / Physiological responses of pigs / Thermography / Drip cooling / 雄琢の管理 / 琢の生理反応 / ドリップリング / サ-モグラフィ
Research Abstract

After the six years of studies since 1985 concerning the effects of heat stress on the testicular functions of boars, we confirmed that the reproductive performance of boars exposed to 30-35゚C for 3 to 6 week were deteriorated. Based on the results, we have been studying the prevention measure of heat stress on boars with a thermography for a couple of years since 1989 receiving this grant in aid for scientific research. We studied the effectiveness of drip cooling system which emits small droplets of water on the boar's neck in the first year. The results showed that the application of the system to boars fed under 29-30゚C natural environment lowered the skin temperature of the boars from 2 to 3゚C. In the second year, two experiments were carried out using the environmental controlled chamber where total 6 boars were exposed to 24゚C (control) for 3 days and then to heat stressed treatment (33゚C for 10 h and 14゚C for 14 h daily) for 4 weeks. In the experiment 1, water droplets were dripped for one minute in every 11 minutes to the neck, shoulder and scrotum of the boars to study the effective part of the body for the reduction of heat stress. The results indicated that dripping on the neck of boars was the most effective. In the experiment 2, we investigated the physiological responses (heart rate, respiration rate, rectal temperature and skin temperature) and the testicular function of boars at controlled and elevated ambient temperature (33゚C) when water droplets were dripp on the neck of boars. The results showed that the drip cooling reduced about 1゚C in both rectal and skin temperatures although heart and respiration rate were not affected. In conclusion, we confirmed that the drip cooling system was the effective practice to prevent heat stress of boars in summer.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 吉本 正・谷田 創・小田 禎己: "局所冷却が暑熱環境下における雄豚の生理反応,皮膚温に与える影響" 日本畜産学会 第83回大会講演要旨. 155 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 吉本 正・小田 禎己・谷田 創・田中 智夫: "種雄豚のサマ-ステリリティ-防止法としてのドリップク-リングの効果" 日本養豚学会誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 吉本 正・澤田 耕一・谷田 創・田中 智夫: "暑熱環境下(33^。C)における雄豚の生理反応,特に皮膚温に及ぼす局所冷却の部位とその効果" 日本養豚学会誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 吉本 正・谷田 創・小田 禎己: "局所冷却が暑熱環境下における雄琢の生理反応,皮膚温に与える影響" 日本畜産学会 第83回大会講演要旨. 155 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 吉本 正・小田 禎己・谷田 創・田中 智夫: "種雄琢のサマ-ステリリティ-防止法としてのドリップク-リングの効果" 日本養琢学会誌.

    • Related Report
      1990 Annual Research Report
  • [Publications] 吉本 正・澤田 耕一・谷田 創・田中 智夫: "暑熱環境下(33℃)における雄琢の生理反応,特に皮膚温に及ぼす局所冷却の部位とその効果" 日本養琢学会誌.

    • Related Report
      1990 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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