An experiment was conducted to evaluate the effects of vitamin or tributyrin supplementations in the diet or drinking water on growth performance and feather pecking of Ben Tre Noi chicken. A total of 240 male Noi chicken at 5 weeks’ old was allocated in a completely randomized design with 3 treatments, 4 replications with 20 chickens/pen as an experimental unit. The 3 treatments (NT) were: (1) Cont: Basal diet without supplementation both vitamin or tributyrin products in feed or drinking water; (2) VIT: Basal diet + 2g vitamin/l drinking water; (3) TBU: Basal diet + 2g tribtyrin/kg feed. Results showed that, final body weight of chickens was highest from chickens in the VIT (1602.3g/head), followed by TBU (1569.1 g/head) and lowest in Cont (1511.2 g/head). So, there was a trend lower average daily gain (ADG) of chickens in cont (19.09 g/head/day) compared to that of chickens in TBU (20.0 g/head/day) and VIT (20.58 g/head/day). Similarly, there was a trend higher feed intake (FI) of chickens fed VIT (63.29 g/head/day) to compared with TBU (60.16 g/head/day) and Cont (59.86 g/head/day). As a result, feed conversion ratio (FCR) of chickens feed Cont (3.09 kg feed/kg gain) was almost similar with chickens feed TBU (3.01 kg feed/kg gain) and VIT (3.02 kg feed/kg gain). The feather pecking rate of chickens supplemented with VIT (7%) and TBU (10%) reduced significantly to compare with Cont (20%). There was no significant difference in carcass evaluation characteristics of chickens in all treatments. In conclusion, supplementation vitamin product in drinking water or tributyrin in diet of Ben Tre Noi chickens tended to improve final weight, and reduced the feather pecking rate of chickens in supplemented treatments to compare with chickens in control group.

Keywords: Growth performance, feather pecking, Ben Tre Noi chicken, tributyrin, vitamin