Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2014.3493.3499PhoprasitPornpun BunchasakChaiyapoom RakangthongChoawit PoeikhamphaTheerawit 1220141424Above-normal temperatures and humidity levels limit the productivity as well as aggravate the survival rate of broilers raised under tropical conditions. This study was conducted to evaluate the effects of adding vitamins and organic acids into the drinking water on the growth performance, carcass yield and meat quality of broilers raised under hot environmental conditions. A total of 1,500 broilers were divided into 5 groups and distributed into 6 pens with each pen consisting 50 birds following a Completely Randomized Design technique. Throughout the 42 days of the feeding trial, all birds received 5 types of drinking water as follows: No vitamins nor organic acids added (control), vitamin C added at 40 mg L-1 water; vitamins C and E added at 40 mg and 85 mg L-1 water, respectively. A complete mixture of various vitamins at 1 g L-1 and a complete mixture of various vitamins, plus 1 g organic acids, added at 1 mL L-1 water. Feeding and flock management were done in accordance with commercial practices. During the 42 days of experiment, the average lowest and highest temperatures were 27.21±1.16 and 34.12±1.15°C, respectively. The results indicated that birds given vitamin C in the drinking water had trended higher body weight and lower mortality rate. When vitamins C and E mixture was combined with organic acids and was added into the drinking water, the increase in body weight was highly significant (p<0.01). The visceral organs of the birds likewise increased. Furthermore, the drip loss percentage of the broilers significantly decreased. So, a combination of vitamins C and E mixed together with organic acids can result in improved growth performance and better meat quality in broilers raised under tropical conditions.]]>Allen, C.D., S.M. Russell and D.L. Fletcher,19977610421046Ayo, J.O., S.B. Oladele and A. Fayomi,199615868Blaha, J. and K. Kang,199730103113Cheah, K.S., A.M. Cheah and D.I. Krausgrill,1995M. longissimus dorsi.]]>39293300Chunshan, Z., W. Zhu, X. Guan and J. Song,200611723Daghir, N.J.,200944615Fuller, R. and G. Perdigon,2003Pages: 292Pages: 292Halliwell, B. and J.M.C. Gutteridge,19892nd Edn.,Howlider, M.A.R. and S.P. Rose,1989306167Jaffar, G.H. and J. Blaha,199641485490Kare, M.R. and J.G. Roger,19761976pp: 29-52pp: 29-52Knarreborg, A., N. Miquel, T. Granli and B.B. Jensen,2002in vitro methodology to study the effects of organic acids on coliform and lactic acid bacteria in the proximal part of the gastrointestinal tract of piglets.]]>99131140Lahucky, R., P. Krska, U. Kuchenmeister, K. Nurnberg and T. Liptaj et al., 200031P NMR spectroscopy and ATPase from postmortem muscle samples and meat quality of pig.]]>43487497Lampromsuk, P., C. Bunchasak, C. Kaewtapee, S. Sawanon and T. Poeikhampha,201212553560Zuprizal, M. Larbier, A.M. Chagneau and P.A. Geraert,199372289295Lueck, E.,1980Pages: 280Pages: 280McKee, J.S. and P.C. Harrison,19957417721785Njoku, P.C.,1986161724Owens, C.M. and A.R. Sams,19987714511454Packer, J.E., J.F. Slater and R.L. Willson,1979278737738Pardue, S.L. and J.P. Thaxton,19846312621268Puron, D., R. Santamaria and J.C. Segura,19943141145Ravindran, V. and E.T. Kornegay,199362313322Skinner, J.T., A.L. Izat and P.W. Waldroup,19917014441447Sosnowka-Czajka, E., I. Skomorucha and E. Herbut,20052005pp: 111114Steel, R.G.D. and J.H. Torrie,19802nd Edn.,Pages: 481Pages: 481Van Laack, R.L. and E. Spencer,1999Longissimus muscle.]]>7717421745Wallis, I.R. and D. Balnave,198425401407Walsh, M.C., D.M. Sholly, R.B. Hinson, K.L. Saddoris and A.L. Sutton et al.,20078517991808Williams, R.B.,199620437447Zhang, L., H.Y. Yue, H.J. Zhang, L. Xu and S.G. Wu et al.,20098820332041