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http://dx.doi.org/10.5536/KJPS.2016.43.3.149

Effects of Stocking Density and Lipopolysaccharide on Immune Organ Weights, Blood Biochemical Profiles and the mRNA Expression of Pro-inflammatory Cytokines in Chicks  

Jang, In-Surk (Dept. of Animal Science and Biotechnology, and the Regional Animal Research Center (RAIC), Gyeongnam National University of Science and Technology)
Song, Min-Hye (Dept. of Animal Science and Biotechnology, and the Regional Animal Research Center (RAIC), Gyeongnam National University of Science and Technology)
Kim, Ha-Na (Dept. of Animal Science and Biotechnology, and the Regional Animal Research Center (RAIC), Gyeongnam National University of Science and Technology)
Moon, Yang Soo (Dept. of Animal Science and Biotechnology, and the Regional Animal Research Center (RAIC), Gyeongnam National University of Science and Technology)
Sohn, Sea Hwan (Dept. of Animal Science and Biotechnology, and the Regional Animal Research Center (RAIC), Gyeongnam National University of Science and Technology)
Publication Information
Korean Journal of Poultry Science / v.43, no.3, 2016 , pp. 149-157 More about this Journal
Abstract
This study was performed to investigate the effects of the stocking density (standard stocking density (SSD, $495cm^2/bird$)) vs. high stocking density (HSD,245cm2/bird) and challenge with lipopolysaccharide (LPS, 5mg/kg BW) on the stress-related physiological indicators in chicks. There was a significant (p<0.05) decrease in body weight, but not in the weight of immune organs, between the SSD and HSD groups. The LPS group resulted in a significant (p<0.05) increase in the weights of the thymus and bursa of fabricius compared with the SSD group. Plasma biochemical components, including aspartate transaminase (AST), alanine transaminase (ALT), blood urea nitrogen, Ca, P, creatine kinase and uric acid, markedly (p<0.05) increased in the LPS birds, although no difference in these parameters was observed between the SSD and HSD birds. Furthermore, the birds challenged with LPS showed a significant (p<0.05) increase in the plasma corticosterone level, although this hormone did not differ between the SSD and HSD groups. In the mRNA expression of pro-inflammatory cytokines, hepatic $IL-1{\beta}$, IL-6 and iNOS in the LPS group significantly (p<0.05) increased compared with those in the SSD group. Thymic mRNA expression of $IL-1{\beta}$, IL-6 and IL-18 in the LPS group also significantly (p<0.05) increased compared with those in the other groups. In addition, mRNA expression of $IL-1{\beta}$ in the bursa of fabricius of the LPS group increased (p<0.05) without affecting the other cytokines. Under high stocking density, thymic $IL-1{\beta}$ was the only cytokine that was up-regulated compared with the SSD group. In conclusion, an acute stress induced by LPS challenge profoundly affected immune organ weight, blood biochemical profiles and pro-inflammatory cytokine expression, while chronic stress did not markedly affect biochemical and immunological parameters, suggesting that chicks under high stocking density could be adapted to prolonged stressors.
Keywords
stocking density; LPS; physiological indicators; chicks;
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Times Cited By KSCI : 2  (Citation Analysis)
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