Tropical Agricultural Research Vol. 24 (1): 12– 20 (2012)Effects of Moringa based Feed Additives on the Growth Performance and Carcass Quality of Broiler Chicken L.S. David∗, J.K. Vidanarachchi1, K. Samarasinghe1, H.W. Cyriland1C.M.B. Dematawewa1Postgraduate Institute of Agriculture University of Peradeniya Peradeniya, Sri Lanka ABSTRACT. The effects of selected herbal dietary supplements on the growth performance and carcass quality of broiler chicken were investigated. Three hundred and eight day-old, male broiler chicks of Indian River strain were randomly allotted to seven experimental diets namely negative control, 0.0125% flavomycin (positive control), 0.1% Moringa leaf powder (MLP), 0.05% Moringa leaf powder, 0.035% Zigbir(commercial herbal product), 0.1% Moringa fruit powder (MFP) and 0.05% Moringa fruit powder, in a complete randomized design. Each treatment contained 44 birds with four replicates of 11 birds each. The body weights and feed consumption was recorded at weekly intervals. Body weight gains and feed conversion ratio (FCR) were calculated. On 42nd day birds were slaughtered and the weight after bleeding, weight after defeathering, total organ weight and dressed weight of individual birds were measured. The carcass quality parameters such as abdominal (fat around gizzard, vent and heart) and subcutaneous (neck, breast and leg) fat contents of five samples from each replicate were determined. The study revealed that all selected herbal dietary supplements significantly (P<0.05) improved the growth performance and carcass yield of broiler chicken compared to the negative control. Among the herbal feed additives, the commercial herbal product Zigbirwas the most effective in improving the growth performance of broiler chicken. Moringa fruit powder of 0.1% increased the gizzard fat content while 0.1% Moringa leaf powder reduced the same. This study revealed that replacing antibiotic growth promoters with herbal supplements has beneficial effects on the growth performance and carcass yield of broiler chicken. Keywords:Broiler chicken, carcass, growth, moringa, zigbirINTRODUCTION Antibiotic growth promoters (AGP) have been used as a feed additive in poultry industry to enhance gut health and to control sub-clinical diseases. With increasing public concerns about bacterial resistance to antibiotics, the use of antibiotics in therapeutic or sub-therapeutic doses in poultry feed has been severely limited or eliminated in many countries. European Union has preventively banned the use of antibiotics as growth promoters since 1stJanuary 2006 (Catala-Gregoriet al., 2008). Therefore, alternatives to AGP need to be proposed to livestock producers in order to maintain animal health, productivity and carcass quality. 1Department of Animal Science, Faculty of Agriculture, University of Peradeniya, Sri Lanka.