Effect of Temperature-Humidity Index on Live Performance in Broiler Chickens Grown From 49 To 63 Days of Age

dc.contributor.author Xin, Hongwei
dc.contributor.author Purswell, Joseph
dc.contributor.author Dozier, William
dc.contributor.author Olanrewaju, Hammed
dc.contributor.author Gates, Richard
dc.contributor.author Davis, Jeremaiah
dc.contributor.author Xin, Hongwei
dc.contributor.author Gates, Richard
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T04:17:23.000
dc.date.accessioned 2020-06-29T22:31:57Z
dc.date.available 2020-06-29T22:31:57Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2012
dc.date.embargo 2012-12-13
dc.date.issued 2012-07-01
dc.description.abstract <p>The thermal environment in poultry housing is a primary influence on production efficiency and live performance. Heavy broilers (body weight > 3.2 kg) typically require high ventilation rates to maintain thermal comfort and production efficiency. However, large birds are observed to pant in mild to moderate thermal conditions, indicating that upper critical temperatures may be lower at larger body weights. Thermal comfort indices such as the temperature-humidity index (THI) integrate the effects of temperature and humidity and may offer a means to predict the effects of thermal conditions on performance. The objective of this study was to determine live performance of heavy broilers over a range of dry-bulb temperature (15°C, 21°C, and 27°C) and relative humidity (50%, 65%, and 80%), hence THI (14.8°C to 26.9°C). A series of four studies were completed with broiler chickens housed in environmental chambers. Live performance parameters including body weight, body weight gain, feed intake, and feed conversion ratio were compared; body temperature was measured in three birds of each treatment during one study. Results show that as THI exceeds approximately 21°C, bird performance significantly declined and body temperature increased up to 1.7°C above nominal body temperature for broilers (41°C). Regression analysis showed that a quadratic relationship exists between THI and the four performance parameters of interest. Prediction accuracy was decreased due to variability in the data and suggests data at additional THI points are necessary.</p>
dc.description.comments <p>This is an ASABE Conference Presentation, Paper No. <a href="http://elibrary.asabe.org/abstract.asp?aid=41619&t=3&dabs=Y&redir=&redirType=" target="_blank">ILES12-0265</a>.</p>
dc.identifier archive/lib.dr.iastate.edu/abe_eng_conf/157/
dc.identifier.articleid 1158
dc.identifier.contextkey 3536131
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_conf/157
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/158
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_conf/157/Xin_2012_EffectTemperatureHumidityIndex.pdf|||Fri Jan 14 20:45:00 UTC 2022
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Poultry
dc.subject.keywords housing
dc.subject.keywords heat stress
dc.subject.keywords ventilation
dc.title Effect of Temperature-Humidity Index on Live Performance in Broiler Chickens Grown From 49 To 63 Days of Age
dc.type article
dc.type.genre conference
dspace.entity.type Publication
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relation.isAuthorOfPublication a61fa792-56f2-4397-8a9c-8cbde8d5c3f1
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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