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dc.contributor.advisorClassen, Hanken_US
dc.creatorGabrush, Tatianaen_US
dc.date.accessioned2013-01-03T22:28:04Z
dc.date.available2013-01-03T22:28:04Z
dc.date.created2011-12en_US
dc.date.issued2012-01-18en_US
dc.date.submittedDecember 2011en_US
dc.identifier.urihttp://hdl.handle.net/10388/ETD-2011-12-261en_US
dc.description.abstractThree experiments utilizing pullets from hatcheries using different beak trimming techniques were conducted to determine the effects of degree of beak trimming on the performance and welfare of White Leghorns. The methods used to modify beak length were: Exp. 1- infrared (IF) varying guide-plate hole sizes (H, Strain 1); Exp. 2 – IF varying IF intensity (I, Strain 2); and Exp. 3 – hot-blade (HB) varying guide-plate hole sizes (H, Strain 3). Beak treatments included control (C), and an attempt to remove 20, 40 and 60% of the beak of day-old chicks. Pullets were housed on litter floor pens for the brooding and rearing period (0-17 wks) and commercial cages for the laying period (17- 59 wks). Performance records were initiated at 19 wks and continued until 59 wks of age. Altering beak length was successful for Exp. 3 only, achieving 14, 31 and 39% reduction in length for the respective treatments. IF methods achieved 30 to 36% reduction regardless of the severity goal. A reduction in growth during part of the brooding and rearing period which continued throughout the duration of the trial for the 60% severity of Exp. 3. Feed intake was reduced in treated birds of Exp. 1 and 3, but not Exp. 2. Hen- day egg production, egg weight and specific gravity were unaffected. However, hen- housed egg production was reduced for the controls of all experiments due to an increase in mortalities. Behaviour observations via scan sampling indicated pain 1-d post- treatment in Exp. 3 by a decrease in running and litter pecking and a non-significant increase in resting. Minor effects of IF treatment were seen 1-d post-treatment, suggesting reduced or a lack of pain. An apparent but inconsistent effect of both HB and IF treatment was showed increase in object pecking throughout the trial. A general decrease in aggressive behaviour in treated birds of all experiments was noted. Feather condition improved for all treated birds. In conclusion, beak trimming regardless of technique or severity caused minor effects on hen performance while improving welfare conditions relating to decreased aggression and mortalities and an improvement in feather condition.en_US
dc.language.isoengen_US
dc.subjectKeyword 1: Beak Trimmingen_US
dc.subjectKeyword 2: Hot-bladeen_US
dc.subjectKeyword 3: Infrareden_US
dc.subjectKeyword 4: Welfareen_US
dc.titleEffects of the Degree of Beak Trimming on the Performance of White Leghornsen_US
thesis.degree.departmentAgricultural and Bioresource Engineeringen_US
thesis.degree.disciplineAnimal Scienceen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US
dc.type.materialtexten_US
dc.type.genreThesisen_US
dc.contributor.committeeMemberGonyou, Harolden_US
dc.contributor.committeeMemberGomis, Susanthaen_US


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