Abstract
This study was conducted to evaluate the effect of Glycyrrhiza glabra root (licorice) extract (LE) administration through drinking water on the performance and some immunological parameters of broiler chickens. A total of 320 onedayold broiler chicks (Cobb 500) according to a completely randomized design were assigned into four treatment groups, namely 0LE, 0.1LE, 0.2LE and 0.3LE because the experimental treatments comprised a control (no inputs) and/or three levels of LE (0.1, 0.2 and 0.3 mg/L drinking water). There was not a significant difference in body weight; feed intake and feed conversion ratio among the birds given the control or the LE levels during the experiment (P > .05). Similarly, LE supplementation through drinking water had no significant (P > .05) effect on immunological parameters including antibody titers against Newcastle disease and Influenza viruses, heterophil and lymphocyte percentages and heterophil to lymphocyte (H/L) ratio as well as liver and lymphoid organ (bursa of Fabricius, thymus and spleen) weights. Original Research Article Annual Research & Review in Biology, 4(4): 675-683, 2014 676
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