International Journal of Poultry Science1682-83561994-7992Asian Network for Scientific Information10.3923/ijps.2019.63.68PoungpongKanokporn SumiyoshiEisuke BunchasakChaiyapoom 22019182Background and Objective: This study was designed to investigate the effects of hydrolyzable tannoids (gallotannoids) on the productive performance and stress hormone levels (cortisol) of broilers, from hatching to 42 days of age, under high environmental stresses (i.e. heat stress, high stocking density, dirty litter). Materials and Methods: Two hundred and eighty-eight male broiler chickens (Ross 308 strain) were fed a corn-soybean meal-based diet under high stress conditions. The birds were devided into three groups: (1) control group, (2) group that received synthetic vitamin C at 286 ppm and (3) group that received gallotanoid at 100 ppm. Feed and water were offered ad libitum. Results: Gallotannoids significantly improved body weight gain (BWG) and feed conversion ratio (FCR) compared to the control and synthetic vitamin C groups (p<0.05) during the finisher period (days 35-42). During the overall period (days 0-42), gallotannoids significantly improved the European production efficiency factor (EPEF) and FCR compared to the control group (p<0.05), whereas the synthetic vitamin C did not significantly improve these measures (p>0.05). Blood cortisol hormone levels were decreased by the synthetic vitamin C, as well as by the gallotanoids (p>0.05). Conclusion: Results indicate that, at the tested doses and under high stress conditions, gallotannoid supplementation can improve broiler production performance more efficiently than synthetic vitamin C.]]>Feddes, J.J., E.J. Emmanuel and M.J. Zuidhoft,200281774779St-Pierre, N.R., B. Cobanov and G. Schnitkey,200386E52E77Simitzis, P.E., E. Kalogeraki, M. Goliomytis, M.A. Charismiadou and K. Triantaphyllopoulos et al.,201253721730Huang, C., H. Jiao, Z. Song, J. Zhao, X. Wang and H. Lin,20159321442153Butterworth, A.,20182018pp: 113-130pp: 113-130Fejercakova, A., J. Vaskova, M. Baca, L. Vasko and S. Marcincak et al.,201498860866Chatterjee, I.B., A.K. Majumder, B.K. Nandi and N. Subramanian,19752582447Njoku, P.C.,1986161724Kadam, A.S., V.D. Lonkar, V.R. Patodkar, S.M. Kolangath and T.A. Bhosale,2009Citrous limon Juice), herbal and synthetic vitamin c on the immune response of broiler chicken during summer stress.]]>35762Tuekam, T.D., R.D. Miles and G.D. Butcher,19946121130Puthpongsiriporn, U., S.E. Scheideler, J.L. Sell and M.M. Beck,2001In vitro lymphocyte proliferation and antioxidant status of laying hens during heat stress.]]>8011901200Ghosal, S., V.K. Tripathi and S. Chauhan,1996Emblica officinalis: Part I. The chemistry and antioxidative effects of two new hydrolysable tannins, Emblicanin A and B.]]>35941948Muruganandam, A.V., J. Singh and S.K. Agrawala,200234374Bhattacharya, A., A. Chatterjee, S. Ghosal and S.K. Bhattacharya,1999Emblica officinalis (Amla).]]>37676680Bhattacharya, A., S. Ghosal and S.K. Bhattacharya,2000Emblica officinalis (amla) in chronic stress induced changes in rat brain.]]>38877880Bhattacharya, S.K., A. Bhattacharya, K. Sairam and S. Ghosal,20029171174Jose, J.K. and R. Kuttan,1995Emblica officinalis.]]>196370Bhandari, P.R. and M.A. Kamdod,2012Emblica officinalis (Amla): A review of potential therapeutic applications.]]>6257269Chang, M.S.H., F.H. Ming, I.J. Wu, P. Tsai and C.H. Cheng,200591113Nagra, S.S., Y. Singh and S. Sodhi,2010114550Chatterjee, S., A. Sharma and K. Ashish,2009311012Mahmoud, K.Z., F.W. Edens, E.J. Eisen and G.B. Havenstein,2004Gallus gallus domesticus) subjected to cyclic heat stress.]]>1373542Chatterjee, S., S.N. Das, B.P. Singh, A. Sharma and S.K. Agrawala,2006121115Lohakare, J.D., J.K. Kim, M.H. Ryu, T.W. Hahn and B.J. Chae,200514670678