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The objective of this study was investigate the effects of a multi-strains yeast (S. cerevisiae and C. jadinii) fractions product, YANG, on the health and performance of young male dairy calves (17±3d). At a commercial farm, 158 veal calves were enrolled and divided in two groups: a control group (CTR) 57 animals (no supplementation) and a treated one (TRT) 101 animals (YANG supplementation), both balanced for live weight. TRT received YANG through the milk replacer: 5g/h/d during the first 30d, then 3g/h/d until d90. From d90 to 190 (slaughter) the diet was the same for both groups. For all animals, individual carcass weights, mortality and morbidity (veterinary treatments) were collected. Blood parameters (Hg, RDW, MCV; d30, 73, 115, 150) and electrophoresis for blood protein characterization (d47, 118) were analysed in 23 randomly selected animals (12 CTR and 11 TRT). On sampled animals, body weights were measured (d0, 47, 82). No differences were observed on carcass weights at slaughter and carcass classification between the two groups. However, sampled animals’ ADG was impacted. ADG from d0 to 47 and 47 to 82 was 263g/d and 321g/d higher, in TRT than in CTR (0.47kg/d, P=0.01; 1.01kg/d, P