title: The effects of different beak trimming techniques on plasma corticosterone and performance criteria in Single Comb White Leghorn hens.
abstract: DeKalb XL chicks were given a beak trim at 6 d of age (6DP) with a 2.8-mm gauge and a beak trim at 11 wk (11WB) with a block cut approximately 2 mm anterior to the nasal openings. Corticosterone (CS) levels of the 6DP treatment were (P < or = 0.01) elevated above nontrimmed CS levels at 2 h posttrim; and BW and feed consumption (FC) of the 6DP were depressed until 8 wk of age. At 11 wk of age, CS of the 11WB treatment was (P < or = 0.02) elevated above controls at 1, 2, 8, and 5 wk posttrim. The 11WB treatment resulted in a decrease in FC and a reduction in BW at 12, 14, and 16 wk of age, whereas there were no differences among treatments in livability during the pullet phase. At 72 wk of age, FC of the nontrimmed controls was greater than both beak trimmed treatments, and both beak trimmed treatments had greater hen housed eggs, percentage hen day egg production, and percentage livability. Both beak trimmed treatments resulted in better egg income, feed cost per hen, and net income (NI). The 6DP and 11WB beak trim treatments resulted in an improvement of NI per hen of 1.48 dollars and 1.86 dollars, respectively. In addition, both beak trimmed treatments exhibited better feather score and Hansen's test (fearfulness). It was concluded that pullets and hens could adapt to the physiological stress of beak trimming and out perform, during a lay phase, controls whose beaks were not trimmed.
authors.affiliation: Department of Poultry Science, North Carolina State University, Box 7608, Raleigh, North Carolina 27695-7608, USA. Gary_Davis@ncsu.edu
authors.forename: G S
authors.initials: GS
authors.lastname: Davis
authors.forename: K E
authors.initials: KE
authors.lastname: Anderson
authors.forename: D R
authors.initials: DR
authors.lastname: Jones
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D001502:Beak / Q000601:surgery*; D001522:Behavior, Animal; D001835:Body Weight / Q000502:physiology; D002645:Chickens / Q000502:physiology*; D003345:Corticosterone / Q000097:blood*; D005239:Fear / Q000502:physiology; D005241:Feathers; D005247:Feeding Behavior / Q000502:physiology; D005260:Female; D007962:Leukocytes / Q000502:physiology; D011863:Radioimmunoassay; D013534:Survival / Q000502:physiology
chemical_list: D003345:Corticosterone