?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Br%C3%83%C2%BCterei%3A+Einfluss+von+Licht+im+Brutschrank+auf+das+Verhalten+von+Junghennen&rft.subject=+Poultry&rft.description=Definition+of+the+problem%3A%0D%0AImitated+natural+light+conditions+during+the+artificial+incubation+may+influence+pullets'+behaviour+in+being+adapted+to+the+diurnal+rhythm.+%0D%0AMethodology%3A%0D%0ATo+study+these+effects%2C+eggs+were+set+in+a+commercial+incubator+either+in+the+dark+control+or+under+full+spectrum+light+tubes+(Philips+TL95%2C+36+watt).+To+imitate+the+light+changes+by+a+clucking+hen%2C+the+eggs+were+exposed+to+light+for+twelve+hours+a+day+with+a+light-intensity+of+20+lux.+After+six+hours+there+was+a+step-up+in+light+intensity+to+1000+lux+for+20+minutes.+After+the+incubation+period%2C+at+day+18+of+incubation%2C+all+eggs+were+transferred+to+the+hatching+compartments.+After+hatching%2C+the+chickens+were+reared+in+paired+groups+under+Swiss+organic+standards.+Each+group%2C+containing+1000+pullets%2C+was+observed+at+the+age+of+2%2C+4%2C+8+and+10+weeks+in+5+trials.+Several+categories+of+behaviour%2C+activity+and+the+diurnal+rhythm+were+observed+(scan+sampling).+Hatchability+per+cent%2C+mortality%2C+weight+and+feather+scoring+at+the+age+of+10+weeks+were+recorded.%0D%0AResults%2C+conclusion%2C+state+of+the+art%3A%0D%0AThere+is+no+constant+significance+that+light+exposure+during+the+incubation+period+affects+the+diurnal+rhythm+and+behaviour+of+young+laying+hens.+It+seems+to+be%2C+that+the+rearing+conditions+and+management+are+still+more+important.&rft.type=Project+description&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Forgprints.org%2F6477%2F1%2Ffibl-projekt-tierzucht-tierhaltung-brutschrank.pdf&rft.identifier=%7BProject%7D+Br%C3%83%C2%BCterei%3A+Einfluss+von+Licht+im+Brutschrank+auf+das+Verhalten+von+Junghennen.+[Effect+of+lighted+incubation+on+the+behaviour+of+laying+hen+pullets.]+Runs+2004+-+2004.+Project+Leader(s)%3A+Hirt%2C+Helen%2C+Research+Institute+of+Organic+Agriculture+(FiBL)%2C+CH-5070+Frick.+More+information+online+at+%3Chttp%3A%2F%2Fwww.fibl.org%2Fde%2Fschweiz%2Fforschung%2Ftierhaltung.html+%3Chttp%3A%2F%2Fwww.fibl.org%2Fde%2Fschweiz%2Fforschung%2Ftierhaltung.html%3E%3E.&rft.relation=http%3A%2F%2Forgprints.org%2F6477%2F