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Poultry Science, Vol 85, Issue 5, 819-824
Copyright © 2006 by Poultry Science Association

Articles

Stocking density and physiological adaptive responses of broilers

JP Thaxton, WA Dozier 3rd, SL Branton, GW Morgan, DW Miles, WB Roush, BD Lott, and Y Vizzier-Thaxton

Department of Poultry Science, Mississippi State University, Mississippi State 39762, USA. pthaxton@poultry.msstate.edu

Three trials were conducted to assess the effects of stocking density on physiological adaptive responses of broilers. Male broilers were reared in floor pens under conditions similar to those used commercially in the United States. Accepted indicators of adaptation to a stressor were measured on d 49 including plasma concentrations of corticosterone, glucose, cholesterol, and total nitrites as an indicator of nitric oxide, as well as heterophil:lymphocyte ratio. In trial 1, calculated stocking densities were 20, 25, 30, 35, 40, 45, 50, and 55 kg of BW/ m2 and in trials 2 and 3, stocking densities were 30, 35, 40, and 45 kg of BW/m2. Stocking densities were calculated based on a final BW of 3.3 kg. Linear trend analyses were used to assess the role of stocking density on each of the physiological parameters. Results indicate that stocking density did not cause physiological adaptive changes indicative of stress.


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