Heat and Moisture Production of Molting Laying Hens

dc.contributor.author Chepete, H.
dc.contributor.author Xin, Hongwei
dc.contributor.author Xin, Hongwei
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T04:21:02.000
dc.date.accessioned 2020-06-29T22:32:07Z
dc.date.available 2020-06-29T22:32:07Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2002
dc.date.embargo 2012-12-14
dc.date.issued 2002-07-01
dc.description.abstract <p>Heat and moisture production rates (HP, MP) of modern 68- to 75-week-old Hy-Line W- 36 laying hens during the molting stage were measured using large-scale indirect calorimeters that mimic commercial production settings. The HP and MP were measured continuously during acclimation, fasting, restricted feeding, and postmolt or normal periods. Total HP (THP) was partitioned into latent and sensible HP (LHP, SHP), which incorporated the influence of fecal moisture evaporation. THP during fasting (averaging 4.8 W/kg) and restricted feeding (averaging 6.0 W/kg) periods averaged 29 and 13% lower than that during postmolt period (averaging 6.8 W/kg). Correspondingly, LHP averaged 1.9 W/kg and 1.8 W/kg and was 31 and 34% lower than that during postmolt period, which averaged 2.7 W/kg. Likewise, SHP averaged 2.9 W/kg during fasting period and was 28% lower than during postmolt period, which averaged 4.1 W/kg. The average SHP between restricted feeding and postmolt periods were similar (4.2 vs. 4.1 W/kg, respectively). The respiratory quotient (RQ) averaged 0.71, 0.76, and 0.92 during fasting, restricted feeding, and postmolt periods, respectively. HP values during the light period were significantly higher (P<0.05) than those during the dark period. The daily mean and diurnal LHP as a percentage of THP were similar during fasting and postmolt periods and were comparatively 10% lower during restricted feeding period. The results of this study provide a new thermal load database for design of building ventilation systems for laying hens undergoing molting phase.</p>
dc.description.comments <p>This is an ASAE Meeting Presentation, Paper No. <a href="http://elibrary.asabe.org/abstract.asp?aid=10478&t=3&dabs=Y&redir=&redirType=" target="_blank">024071</a>.</p>
dc.identifier archive/lib.dr.iastate.edu/abe_eng_conf/175/
dc.identifier.articleid 1175
dc.identifier.contextkey 3538173
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_conf/175
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/178
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_conf/175/Xin_2002_HeatMoistureProduction.pdf|||Fri Jan 14 21:24:13 UTC 2022
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Thermal load
dc.subject.keywords Ventilation
dc.subject.keywords Bioenergetics
dc.title Heat and Moisture Production of Molting Laying Hens
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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