Influence of emulsifier blends having different hydrophilic-lipophilic balance value on growth performance, nutrient digestibility, serum lipid profiles, and meat quality of broilers.

Energy is a major cost component in diets for poultry. We hypothesized that the supplementation of emulsifier blends in broiler diets may contribute to the efficient utilization of energy and in increasing fat digestibility, thereby improving performance. To test our hypothesis, an experiment was conducted to evaluate the effect of a blend of emulsifiers on growth performance, nutrient digestibility, serum lipid profiles, and meat quality of broilers. A total of 768 1-d-old Ross 308 male broiler chicks with an average initial body weight of 45.55 ± 0.34 g were used in a 35 days feeding trial. Broilers were sorted into 4 treatments, 12 replications per treatment, and 16 birds per pen. Dietary treatments consisted of corn-soybean meal based basal diet and the basal diet supplemented with 0.05%, 0.075%, and 0.10% emulsifier. As a result of this study, the inclusion of 0.05%, 0.075%, and 0.10% emulsifier blends (sodium stearoyl-2-lactylate (SSL) and Tween 20) in the basal diet linearly increased (P = 0.0001) body weight gain (BWG) and improved feed conversion ratio (FCR) (linear effect P = 0.0001) on d 7 to 21, d 21 to 35 as well as overall. Broilers fed with different levels of emulsifier blends also showed a linear increment (P < 0.05) in dry matter (DM) and fat digestibility. A trend of linear reduction (P = 0.051) in low density lipoprotein (LDL) in the serum of broilers fed emulsifier blend was observed. The lightness value of breast muscle color linearly increased (P = 0.001), the redness and yellowness values tended to increase (P = 0.072 and P = 0.094 respectively), and the water holding capacity (WHC) showed trends in reduction (P = 0.078) with an increase in the level of emulsifier blends. With regards to relative organ weight, spleen weight was linearly (P = 0.001) reduced with the increase in the supplemental levels of emulsifier blends. A positive correlation between emulsifier content in the diet and BWG, DM and fat digestibility, and breast muscle color indices, were also observed. In conclusion, emulsifier blend supplementation positively influenced growth performance and nutrient digestibility in broiler chickens.