title: Different effects of infrared and one-half hot blade beak trimming on beak topography and growth.
abstract: This study examined the effects of infrared beak treatment (IR-BT) and hot blade beak trimming (HB-BT) on beak length and production in laying hen pullets. Seventy-two 1-d-old birds were randomly assigned to the HB-BT, IR-BT, or control group. Birds were pair housed by treatment, and beak images and production indices were obtained posttreatment at fixed intervals for 10 wk. Immediately after treatment, HB-BT beaks were shorter than control or IR-BT beaks (P < 0.01), whereas control and IR-BT beaks remained comparable in length until the onset of tissue degeneration and erosion of the IR-BT beaks at 1 to 2 wk posttreatment. At wk 2 posttreatment, beaks were longest in control birds, intermediate in IR-BT birds, and shortest in HB-BT birds (P < 0.01). Thereafter, an increase in beak length in all treatments was observed over time (P < 0.01), but HB-BT beaks had the greatest regrowth. The beak length of birds in the HB-BT group was similar to that of birds in the IR-BT group from wk 3 to 8, and then grew longer at wk 9 and 10 posttreatment (P < 0.01). The effects of treatments on BW emerged at d 5 posttreatment. The BW of birds in the HB-BT group was suppressed up to and including wk 9 posttreatment compared with that of control birds (P < 0.05) and was significantly lower than that of birds in the IR-BT group between 2 and 4 wk posttreatment (P < 0.05). Birds in the IR-BT group did not differ from control birds after wk 3 posttreatment (P < 0.05). By the final week of the study, differences in BW across treatments were no longer apparent (P > 0.05). For the most part, feed intake was higher in control birds, intermediate in birds in the IR-BT group, and lowest in birds in the HB-BT group until wk 9 posttreatment (P < 0.05). Similarly, feed waste was generally higher in control birds and least in birds in the HB-BT group (P < 0.05). The IR-BT treatment appeared to be more effective at inhibiting beak regrowth, with a less pronounced effect on feed intake than the HB-BT treatment in laying hen pullets.
authors.affiliation: USDA-ARS, Livestock Behavior Research Unit, West Lafayette, IN 47907, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Marchant-Forde
authors.forename: H W
authors.initials: HW
authors.lastname: Cheng
mesh_terms: D000374:Aggression; D000821:Animal Feed; D000822:Animal Husbandry / Q000379:methods; D000818:Animals; D001502:Beak / Q000033:anatomy & histology* / Q000254:growth & development* / Q000528:radiation effects; D001522:Behavior, Animal; D001835:Body Weight; D002645:Chickens / Q000254:growth & development*; D002149:Energy Intake; D005260:Female; D007259:Infrared Rays; D010058:Oviposition