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 2018-02-13T04:18:01.000
dc.date.accessioned 2020-06-29T22:37:41Z
dc.date.available 2020-06-29T22:37:41Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2009
dc.date.embargo 2012-12-13
dc.date.issued 2009-01-01
dc.description.abstract <p>Current and relevant heat and moisture production data for laying hens are necessary for sizing and operating ventilation systems for commercial layer housing. Different stocking densities are being adopted in cage layer facilities, 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 heat and moisture production, via indirect calorimetry, for four different stocking densities (348, 387, 465, or 581 cm2 hen-1; 54, 60, 72, or 90 in.2 hen-1) and two group sizes (8 or 16 hens per cage). Data were collected under thermoneutral (24°C or 76°F) and heat-challenging conditions (32°C or 90°F and 35°C or 95°F). No notable differences in heat and moisture production were observed among the treatments under the experimental conditions. Room-level 24 h time-weighted mean sensible heat production, latent heat production or moisture production, and total heat production, respectively, were found to be 2.8 to 3.1 W kg-1, 3.5 to 3.7 W kg-1, and 6.4 to 6.6 W kg-1 at 24°C; 0.7 to 1.0 W kg-1, 4.9 to 5.2 W kg-1, and 5.6 to 6.1 W kg-1 at 32°C; and -1.0 to -0.4 W kg-1, 5.9 to 6.5 W kg-1, and 5.4 to 5.7 W kg-1 at 35°C. These results imply that for existing laying hen houses, reducing stocking density, and thus flock size, will reduce the heat and moisture generated within the houses. This may lead to difficulties in maintaining desired temperatures without compromising air quality during cold weather, but reducing stocking density may offer benefits for heat stress prevention and relief during hot weather.</p>
dc.description.comments <p>This article is from <em><a href="http://elibrary.asabe.org/abstract.asp?aid=29204&t=3&dabs=Y&redir=&redirType=" target="_blank">Transactions of the ASABE</a> </em>52, no. 6 (2006): 2027–2032.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/174/
dc.identifier.articleid 1167
dc.identifier.contextkey 3536176
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/174
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/912
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/174/Xin_2009_EffectsStocktingDensityGroupSizeHeat.pdf|||Fri Jan 14 21:21:58 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Caged layer
dc.subject.keywords Design
dc.subject.keywords Latent heat production (LHP)
dc.subject.keywords Moisture production (MP)
dc.subject.keywords Sensible heat production (SHP)
dc.subject.keywords Total heat production (THP)
dc.subject.keywords Ventilation
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 article
dspace.entity.type Publication
relation.isAuthorOfPublication 36e0a8ce-fa2e-4df4-9f67-8d1717122650
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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