?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Divergent+selection+on+feather+pecking+behaviour+in+laying+hens+(Gallus+gallus+domesticus)&rft.creator=Kjaer%2C+Dr.+J%C3%83%C2%B8rgen+B.&rft.creator=S%C3%83%C2%B8rensen%2C+Prof.+Poul&rft.creator=Su%2C+Dr.+Guosheng&rft.subject=+Breeding+and+genetics&rft.description=A+selection+experiment+was+initiated+in+1996+in+which+selection+for+(HP+line)+and+against+(LP+line)+feather+pecking+was+performed.+The+foundation+stock+was+a+White+Leghorn+layer+strain+established+in+1970+and+maintained+since+then+as+a+random+bred+control+line+at+the+Institute.+Six+hatches+were+produced+over+three+generations.+At+the+age+of+68+wk+(gen.+0%2C+1996)%2C+35+wk+(gen.+1%2C+1997)%2C+30+wk+(gen.+2%2C+1998)%2C+and+27+wk+(gen.+3%2C+1999)+female+birds+were+transferred+to+observation+pens+and+their+feather+pecking+behaviour+was+recorded.+In+each+generation%2C+30+females+and+8+males+were+selected+from+approx.+200+females+and+60+males.+Selection+criteria+was+breeding+value+estimated+by+animal+model+on+the+trait++%C3%A2%C2%80%C2%98number+of+bouts+of+feather+pecking+per+bird+per+hour%C3%A2%C2%80%C2%99.++%0D%0AFeather+pecking+behaviour+in+adult+hens+was+significantly+higher+in+HP+than+in+LP.+In+generation+2+the+following+was+recorded%3A+Bouts+per+bird+per+hour+(3.10+versus+1.37%2C+P%3C0.01)%2C+pecks+per+bird+per+hour+(7.04+versus+3.58%2C+P%3C0.05)+and+proportion+of+hens+recorded+feather+pecking+in+the+180+minutes+observation+period+(67+versus+56%25%2C+P%3C0.05).+In+generation+3+the+following+was+recorded%3A+Bouts+per+bird+per+hour+(4.56+versus+0.63%2C+P%3C0.001)%2C+pecks+per+bird+per+hour+(13.9+versus+2.51%2C+P%3C0.001)+and+proportion+of+hens+recorded+feather+pecking+in+the+180+minutes+observation+period+(75+versus+49%25%2C+P%3C0.001).%0D%0AIn+generation+3%2C+plumage+condition+was+better+in+LP+on+neck%2C+breast%2C+back%2C+wings+and+tail%2C+as+well+as+overall+(P%3C0.001).+Body+weight+did+not+differ+between+lines+in+generation+2%2C+but+in+generation+3%2C+HP+hens+were+on+average+heavier+than+LP+hens+at+the+age+of+27+weeks+(1435+g+versus+1371+g%2C+P%3C0.001).+%0D%0A+%0D%0A&rft.date=2001&rft.type=Journal+paper&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Forgprints.org%2F1565%2F1%2FFinal_edition.pdf&rft.identifier=Kjaer%2C+Dr.+J%C3%83%C2%B8rgen+B.%3B+S%C3%83%C2%B8rensen%2C+Prof.+Poul+and+Su%2C+Dr.+Guosheng+(2001)+Divergent+selection+on+feather+pecking+behaviour+in+laying+hens+(Gallus+gallus+domesticus).+Applied+Behaviour+Science%2C+71%2C+pp.+229-239.+*&rft.relation=http%3A%2F%2Forgprints.org%2F1565%2F