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dc.contributor.supervisorKebreab, Ermias (Animal Science) House, James (Animal Science)en_US
dc.contributor.authorNeijat, Mohamed
dc.date.accessioned2011-08-30T15:58:29Z
dc.date.available2011-08-30T15:58:29Z
dc.date.issued2011-08-30
dc.identifier.citationNeijat, M., J. D. House, W. Guenter, and E. Kebreab (2011). Production performance and nitrogen flow of Shaver White layers housed in enriched or conventional cage systems. Poult. Sci. 90:543-554en
dc.identifier.urihttp://hdl.handle.net/1993/4788
dc.description.abstractThe current data provide estimates of the flow of nitrogen (N), calcium (Ca) and phosphorus (P) in Shaver White layers housed under conventional cage (CC) and enriched cage (EC) systems from 19 to 63 wks of age. The experiment was conducted at the University of Manitoba poultry unit. Both feed disappearance (P < 0.01) (92.5 vs. 95.0 ± 0.6 g/hen/d, DM basis) and manure output (P < 0.01) (79.8 vs. 91.3 ± 1.2 g/hen/d, fresh basis and 27.0 vs. 28.1 ± 0.2 g/hen/d, DM basis) were lower in hens housed in EC compared to CC. Manure DM was 34.1 and 31.0 ± 0.3% for EC and CC, respectively. Feed conversion ratio; body weight; and egg production, weight and mass were not significantly different between the two systems. Although there was no difference in the overall manure N (EC: 1.94 vs. CC: 1.96 ± 0.02 g/hen/d, respectively), N balance was greater (P < 0.05) for the CC compared to EC system (85.0 vs. 30.2 ± 13.6 mg/hen/d, respectively). Lower (P < 0.01) Ca and P excretions were observed in EC (Ca: 2.11 vs. 2.29 ± 0.04 and P: 0.619 vs. 0.643 ± 0.005 g/hen/d) compared to CC. Overall egg N output was similar between the systems. Although lower Ca deposition (P < 0.0001) (2.07 vs. 2.13 ± 0.01 g/hen/d) and output (P < 0.05) (38.3 vs. 38.8 ± 0.15 mg/g egg) were noted in eggs from EC compared to CC, shell quality measurements were not different between the two systems. In addition, Ca outputs in eggs expressed as a proportion of Ca intake in both systems were similar (56.5 vs. 56.6 ± 0.51). Although overall mean P retention (-7.22 vs. -7.45 ± 0.71% P intake) was not different between the two groups of hens, Ca retention was higher (P < 0.05) in EC than CC hens (-1.37 vs. -4.76 ± 0.89% Ca intake, respectively). In addition to providing environmental enrichment and maintaining the production performance to the levels of those achieved by CC systems, EC may also help in reducing Ca and P excretions and improving their efficiency of utilization.en
dc.language.isoengen_US
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectcage systemen
dc.subjectcalciumen
dc.subjectphosphorusen
dc.subjectnitrogenen
dc.subjecthenen
dc.titleNutrient dynamics and production performance of Shaver White laying hens housed in either enriched or conventional cage systems over an entire production cycleen
dc.typeinfo:eu-repo/semantics/masterThesis
dc.typemaster thesisen_US
dc.degree.disciplineAnimal Scienceen_US
dc.contributor.examiningcommitteeGuenter, Wilhelm (Animal Science) Flaten, Don (Soil Science)en_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.noteOctober 2011en_US


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