权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

滴水冷却系统对热应激公猪繁殖性能的影响

基本信息

批准号：
01480098
负责人：
YOSHIMOTO Tadashi
金额：
$ 4.42万
依托单位：
Azabu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01480098/
关键词：
Summer 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

项目摘要

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.

自1985年以来，经过6年关于热应激对公猪睾丸功能影响的研究，我们证实，30-35ﾟC暴露3-6周后，公猪的繁殖性能恶化。根据这一结果，我们从1989年开始用热像仪研究公猪热应激的预防措施，并获得了这笔科学研究资助。我们在第一年研究了滴水冷却系统的有效性，该系统在公猪的脖子上释放出小水滴。结果表明，将该系统应用于29~30ﾟC自然环境下饲养的公猪，可使公猪的皮肤温度从2ﾟC降至3ﾟC。第二年，在环境控制室中进行了两次实验，共6头公猪在24ﾟC(对照)下暴露3天，然后进行了4周的热应激处理(33ﾟC每天10 h，14 Cd 14 h)。在实验一中，每隔11分钟将水滴滴到公猪的颈部、肩部和阴囊，以研究身体的有效部位对热应激的抑制作用。结果表明，在公猪脖子上滴注效果最好。在实验2中，我们研究了水滴滴到公猪脖子上时，公猪在控制和升高环境温度(33ﾟC)下的生理反应(心率、呼吸频率、直肠温度和皮温)和睾丸功能。结果表明，尽管心脏和呼吸频率没有受到影响，但滴水降温使直肠和皮肤温度降低了约1ﾟC。综上所述，我们证实了滴水降温系统是预防夏季公猪热应激的有效措施。