Daily Variation of Thyroid Hormones in Broiler Under High-Temperature Conditions

dc.contributor.author Tao, Xiuping
dc.contributor.author Dong, Hongmin
dc.contributor.author Zhang, Ziyi
dc.contributor.author Xin, Hongwei
dc.contributor.department Department of Agricultural and Biosystems Engineering (ENG)
dc.date 2018-02-13T04:15:15.000
dc.date.accessioned 2020-06-29T22:31:52Z
dc.date.available 2020-06-29T22:31:52Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2005
dc.date.embargo 2012-12-13
dc.date.issued 2005-05-01
dc.description.abstract <p>Market-size (61-68 day-old) AA broiler chickens were exposed to simulated high-cyclic summer temperatures of North, Central and South China for 5 continuous days. Blood samples were collected at 0AM, 4AM, 8AM, 0PM, 4PM and 8PM each day, and concentrations of triiodothyronine (T3) and thyroxine (T4) were determined by double-antibody radioimmunoassay (RIA). T3, T4 concentration and T3/T4 ratio had two peaks, but the daily variation patterns of thyroid hormones were different between each other. T3 peaked at 12 AM and 12 PM, while T4 peaked at 8 AM and 12 PM, with the two peaks of T3/T4 ratio showing at 4 AM and 12 AM. The lowest concentrations of both T3 and T4 occurred at 4 PM. According to above results, the blood samples should be collected around the time corresponding to the peak of temperature sinusoid, when thyroid hormones (both T3 and T4 concentrations) are used to evaluate the heat stress status of broilers.</p>
dc.description.comments <p>This proceeding is from Proceedings of the Seventh International Symposium, 18-20 May 2005 (Beijing, China) Publication Date 18 May 2005. Paper No. <a href="http://elibrary.asabe.org/abstract.asp?aid=18407&t=3&dabs=Y&redir=&redirType=" target="_blank">701P0205</a>.</p>
dc.identifier archive/lib.dr.iastate.edu/abe_eng_conf/147/
dc.identifier.articleid 1149
dc.identifier.contextkey 3535864
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_conf/147
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/147
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_conf/147/Xin_2005_DailyVariationThyroid.pdf|||Fri Jan 14 20:24:48 UTC 2022
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Heat stress
dc.subject.keywords broiler
dc.subject.keywords thyroid hormone
dc.subject.keywords diurnal rhythm
dc.title Daily Variation of Thyroid Hormones in Broiler Under High-Temperature Conditions
dc.type article
dc.type.genre conference
dspace.entity.type Publication
relation.isAuthorOfPublication 36e0a8ce-fa2e-4df4-9f67-8d1717122650
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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