Investigation on main and interaction effects of Ultimate acid and chicory extract on performance and some immune system parameters in broiler chickens

Document Type : Research Paper

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Abstract

The aim of this experiment was to evaluate the effects of Ultimate acid (UA) and chicory extract (CE) on performance, immune system and lymphoid organs (thymus, spleen and bursa of fabricius) of broiler chickens. Three hundred thirty one-day old broiler chicks (Ross 308, male and female) were allocated to the experimental units based on a completely randomized design using a factorial arrangement of 2×3 with two levels of chicory extract (CE, 0 and 2 ml/1 liter of water) and three levels of Ultimate acid (UA, 0, 0.5 and 1 ml/1 liter of water). Each treatment replicated 5 times with 11 chicks each. Antibody titer against NDV was determined by HI assay. On day 42 from each replication 2 chickens slaughtered and lymphoid organs separated and weighted. In spite of non-significant effect of UA supplementation on feed conversion ratio (FCR), its effect on both daily feed intake (DFI) and daily weight gain (DWG) (P<0.05) were significant compared to the control group and its addition to drinking water led to a reduction in the both cases. Body WG of chicks were affected by CE supplementation and was higher in CE group compared to the control (p<0.05) but the effects on DFI and FCR were not significant. UA supplementation did not show any significant effect on relative weights of lymphoid organs. Relative weight of thymus was affected by CE supplementation (P<0/05) but the effect on relative weights of spleen and bursa of fabricius were not significant. Main and interaction effects of UA and CE on antibody titer against NDV were significant (P<0/05) and were higher in supplemented groups compared to the control. In spite of a positive and significant effect for CE supplementation on growth performance of boiler chickens, the effect for UA was negative. UA and CE supplementation both increased the humoralimmune response of broiler chickens.

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References

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Animal Sciences Journal
Volume 29, Issue 110
June 2016
Pages 81-90

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