FR 3077707 A1 20190816 FR 1851305 A 20180215 Composition anti-stress Effects of a vectorized dietary betaine and antioxidants supplementation on growth performance, oxidative stress and carcass quality of broilers kept under high environmental temperatures Toussaint S2, Klein 51, Castier Jl, Brévault Nl, Méssant Cl 1MIX3IENCE, BP CS 17228, 35172 BRUZ, France 2 Presenting Author Broil ers growt h performance and breast meat yield are impaired by high envi ronmental temperature. Sach impairment is attributable to a reduction in feed intake and an increase in oxidative stress, which induces hemolysis and lower carcassquality. Feeding betai ne may reduce such negat ive effects t hanks to its osmoprotect ive propert i es as wel I as its role as met hyl donor. In addition, vitamin C and other antioxidants may protect against oxidative stress and hemolysis. As betaine and vitamins are aggressive or versatile active ingredients, a specific vectorizing process with a selected vegetal fat has been applied (BeTaHit). The aim of this study was to evaluate the effect of BeTaHit on growth performance, carcass quality and hemolysis of broilers raised in high housing temperature. A total of 192 male Ross 308 broilerswere al located to a randomized complete block design with 3 treat ment groups: NC (negat ive control, no BeTaHit), B1 (NC+ 750 g/ T BeTaHit) and B2 (NC+ 1300 g/ T BeTaHit), each replicated 16 times with 4 birds per cage. From 21d to 35d, housing temperature varied every day to si mul ate high summer temperatures up to 30° C. Growt h performance was measured during the whole experiment. At 36d, birds were sacrificed. Flasmatic oxidative stress markers as well as hemolysis score were compared between NC and B2. Dripping loss and breast meat yield were compared across ail treatments. Data were analyzed using a univariate analysis of variance and Tukey's range test as a post hoc test. Di et ary supplementation had a si gnif icant effect on body weight gain, feed i nt ake and feed efficiency between 0 and 36d (P