Effects of Housing Systems on Physiological and Immunological Parameters in Laying Hens
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초록
The aim of this study was to assess the effects of housing systems on physiological and immunological responses as stress indicators in laying hens. A total of 500 White Leghorn aged 16 weeks were allotted into ten conventional cages(10 birds/cage and 810cm2/bird) and four floor pens(100 birds/pen and 2,800cm2/bird) for 24 weeks. The hens housed in conventional cages with higher stocking density resulted in a significantly(P<0.05) lower BW compared with those housed in floor pens with lower stocking density without affecting the relative weights of immune organs between housing conditions. In plasma biochemical values, cholesterol and corticosterone were significantly(P<0.05) lower in the hens housed in floor pens compared with those housed in conventional cages. In pro-inflammatory cytokines, hepatic interleukin(IL)-10 and interferon-gamma(IFN-γ) levels were significantly(P<0.05) higher in the hens housed in conventional cages compared with those kept in floor pens. Splenic and thymic IFN-γ expression was significantly(P<0.05) up-regulated in the hens kept in conventional cages compared with those kept in floor pens without affecting IL-1, IL-10, lipopolysaccharide- induced tumor necrosis factor-α factor(LITAF) and inducible nitric oxide synthase(iNOS). In the bursa of Fabricius, IL-10 and iNOS expression of the hens housed in conventional cages were significantly(P<0.05) higher compared with those of the hens housed in floor pens. In conclusion, layers housed in conventional cages enhanced plasma cholesterol, corticosterone and some pro-inflammatory cytokines in the immune organs compared with those in floor pens.
Abstract
The aim of this study was to assess the effects of housing systems on physiological and immunological responses as stress indicators in laying hens. A total of 500 White Leghorn aged 16 weeks were allotted into ten conventional cages(10 birds/cage and 810cm2/bird) and four floor pens(100 birds/pen and 2,800cm2/bird) for 24 weeks. The hens housed in conventional cages with higher stocking density resulted in a significantly(P<0.05) lower BW compared with those housed in floor pens with lower stocking density without affecting the relative weights of immune organs between housing conditions. In plasma biochemical values, cholesterol and corticosterone were significantly(P<0.05) lower in the hens housed in floor pens compared with those housed in conventional cages. In pro-inflammatory cytokines, hepatic interleukin(IL)-10 and interferon-gamma(IFN-γ) levels were significantly(P<0.05) higher in the hens housed in conventional cages compared with those kept in floor pens. Splenic and thymic IFN-γ expression was significantly(P<0.05) up-regulated in the hens kept in conventional cages compared with those kept in floor pens without affecting IL-1, IL-10, lipopolysaccharide- induced tumor necrosis factor-α factor(LITAF) and inducible nitric oxide synthase(iNOS). In the bursa of Fabricius, IL-10 and iNOS expression of the hens housed in conventional cages were significantly(P<0.05) higher compared with those of the hens housed in floor pens. In conclusion, layers housed in conventional cages enhanced plasma cholesterol, corticosterone and some pro-inflammatory cytokines in the immune organs compared with those in floor pens.
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