Effects of Stocking Density and Group Size on Heat and Moisture Production of Laying Hens under Thermoneutral and Heat Challenging Conditions

dc.contributor.author Green, Angela
dc.contributor.author Xin, Hongwei
dc.contributor.author Xin, Hongwei
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T04:20:03.000
dc.date.accessioned 2020-06-29T22:32:01Z
dc.date.available 2020-06-29T22:32:01Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2008
dc.date.embargo 2012-12-14
dc.date.issued 2008-08-01
dc.description.abstract <p>Current and relevant information regarding heat and moisture production (HMP) of laying hens is important for design and operation of ventilation systems for commercial layer housing. Different stocking densities are being adopted by the cage layer industry, but there is a lack of information concerning the potential impacts of these changes on environmental control. A study was conducted with 24 groups of 48 hens (39 to 46 weeks old) to compare HMP, via indirect calorimetry, for four different stocking densities (348, 387, 465, or 581 cm <sup>2 </sup>/bird; 54, 60, 72, or 90 in<sup>2 </sup>/bird) and two group sizes (8 or 16 birds/cage). Data were collected at thermoneutral (24 <sup>o </sup>C or 76 <sup>o </sup>F) and heat challenging conditions (32 <sup>o </sup>C or 90 <sup>o </sup>F and 35 <sup>o </sup>C or 95 <sup>o </sup>F). No notable differences in HMP were observed among the treatments under the experimental conditions (2.8 to 3.1, 3.5 to 3.7, and 6.4 to 6.6 W/kg 24-h time weighted mean room-level SHP, LHP or MP, and THP, respectively, under 24 <sup>o </sup>C; 0.7 to 1.0, 4.9 to 5.2, and 5.6 to 6.1 W/kg under 32 <sup>o </sup>C; and -1.0 to -0.4, 5.9 to 6.5, and 5.4 to 5.7 W/kg under 35 <sup>o </sup>C). The results imply that for existing laying-hen houses, reducing stocking density and thus flock size may lead to difficulties maintaining desired temperatures without compromising air quality during cold weather, but may offer benefits for heat stress prevention and relief during hot weather.</p>
dc.description.comments <p>This proceeding is from Pp 577-583 in Livestock Environment VIII, Proceedings of the International Symposium. (31 August – 4 September 2008, Iguassu Falls, Brazil) St. Joseph Michigan: ASABE, 31 August 2008. ASAE Pub #<a href="http://elibrary.asabe.org/abstract.asp?aid=25555&t=3&dabs=Y&redir=&redirType=" target="_blank">701P0408</a>.</p>
dc.identifier archive/lib.dr.iastate.edu/abe_eng_conf/164/
dc.identifier.articleid 1172
dc.identifier.contextkey 3537717
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_conf/164
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/166
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_conf/164/Xin_2008_EffectsStockingDensity_Heat.pdf|||Fri Jan 14 20:59:30 UTC 2022
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Cage-layer
dc.subject.keywords Sensible heat production (SHP)
dc.subject.keywords Latent heat production (LHP)
dc.subject.keywords Moisture production (MP)
dc.subject.keywords Total heat production (THP)
dc.subject.keywords Ventilation
dc.subject.keywords Design
dc.subject.keywords Welfare
dc.title Effects of Stocking Density and Group Size on Heat and Moisture Production of Laying Hens under Thermoneutral and Heat Challenging 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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