Effects of litter floor access and inclusion of experienced hens in aviary housing on floor eggs, litter condition, air quality, and hen welfare

dc.contributor.author Oliveira, Jofran
dc.contributor.author Xin, Hongwei
dc.contributor.author Chai, Lilong
dc.contributor.author Millman, Suzanne
dc.contributor.author Xin, Hongwei
dc.contributor.department Animal Science
dc.contributor.department Veterinary Diagnostic and Production Animal Medicine
dc.contributor.department Agricultural and Biosystems Engineering
dc.contributor.department Egg Industry Center
dc.date 2018-12-31T12:50:09.000
dc.date.accessioned 2020-06-29T22:44:11Z
dc.date.available 2020-06-29T22:44:11Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 2018
dc.date.issued 2019-04-01
dc.description.abstract <p>To better understand how relevant intensive systems’ characteristics simultaneously affect the performance and welfare of broiler chickens, a meta-analysis of recent literature was carried out. The study determined the effects of gender, genetics, experimental initial age (EIA, d), stocking density (SD; kg/m2), group size (GS; n), bedding material (yes/no), duration of photoperiod (DP; h), divided scotoperiod (yes/no), feeding phases (1/2/3/>3), environmental control (EC; yes/no), environmental enrichment (yes/no), use of vaccines and other medications (yes/no), experimental duration (d), and relevant 2-way interactions on average daily gain (g/d), average daily feed intake (g/d), FCR (g: g), mortality (%), behavior (%), and gait score (mean value). Predictive equations for response variables were calculated using multiple regression models including a random experiment effect. Among other results, EIA × SD interaction indicated that relatively high SD may improve FCR at older ages, but parallel increased mortality would pose concerns about the actual productive benefits and welfare. Combining large GS and relatively low SD seem to improve performance and decrease flock disturbance. They would also increase leg problems, and so their actual benefits on welfare remain unclear. A gradual increase in FCR seems to occur with longer DP at older EIA (EIA × DP interaction), highlighting the importance of adapting light programs to flock age to optimize performance. The SD × DP and GS × DP interactions predicted increased FCR for longer DP at low SD or large GS, that is, with more effective space available. Longer DP combined with low SD or large GS would overall promote enhanced leg conditions, and therefore welfare. Predictions would not support scotoperiod division from both performance and welfare perspectives. The SD × EC interaction indicated that EC would benefit chicken performance at low SD, although EC would seem to increase leg problems. Our study highlights the complex, interactive nature of production systems’ characteristics on broiler chicken performance and welfare.</p>
dc.description.comments <p>This article is published as Oliveira, Jofran L., Hongwei Xin, Lilong Chai, and Suzanne T. Millman. "Effects of litter floor access and inclusion of experienced hens in aviary housing on floor eggs, litter condition, air quality, and hen welfare." <em>Poultry Science </em>98, no. 4 (2019): 1664-1677. DOI: <a href="https://dx.doi.org/10.3382/ps/pey525" target="_blank">10.3382/ps/pey525</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/980/
dc.identifier.articleid 2264
dc.identifier.contextkey 13496521
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/980
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1802
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/980/2018_XinHongwei_EffectsLitter.pdf|||Mon Dec 31 12:50:09 UTC 2018
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/980/2019_XinHongwei_EffectsLitterFloor.pdf|||Sat Jan 15 02:38:08 UTC 2022
dc.source.uri 10.3382/ps/pey525
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Poultry or Avian Science
dc.subject.disciplines Veterinary Preventive Medicine, Epidemiology, and Public Health
dc.subject.keywords food safety
dc.subject.keywords poultry management
dc.subject.keywords animal welfare
dc.subject.keywords air quality
dc.title Effects of litter floor access and inclusion of experienced hens in aviary housing on floor eggs, litter condition, air quality, and hen welfare
dc.type article
dc.type.genre article
dspace.entity.type Publication
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