Effect of Bacillus subtilis spore (GalliPro®) nutrients equivalency value on broiler chicken performance

Abstract

The experiment was conducted to evaluate the nutrients equivalency value of Bacillus subtilis spore (GalliPro®) for broiler chickens and its potential for decreasing feed nutrients concentration and cost. A total of 720 day old Ross 308 broiler chicks was allocated in 6 treatments (2 sexes×3 diets) with 6 replication for 7 weeks. Dietary treatments: main treatment (MT) was routine broiler diet added 0.2 g/kg GalliPro® (Bacillus subtilis 4×109 CFU/g DSM 17299) and using nutrients equivalency of GalliPro® for feed formulation; negative control (NC) was the same as main treatment without GalliPro® (subtracted the nutrients equivalent value of GalliPro®); positive control (PC) was the same as MT diet in nutrients content but without GalliPro®. Effect of dietary treatments on body weight (BW) was not significant. However, the average BW of male and female chicks receiving negative control diet was 2.0% (68 g) lower than PC and MT groups (P>0.05). Dietary treatments had no significant effect on average daily feed intake. Feed conversion ratio of chicks receiving PC and MT diets were 2.7% better than NC chicks (P<0.01). Male chicks were superior to female in all measured traits (P<0.01). Effect of treatments on carcass characteristics was not significant. There was no interaction between factors on measured parameters. Performance of chicks receiving diet with GalliPro® compared with PC showed that GalliPro® liberated 0.4 crude protein from MT diet and consequently decreased the broiler feeding cost.