پردیس کشاورزی و منابع طبیعی دانشگاه تهران Iranian Journal of animal Science 2008-4773 56 2 2025 06 22 The effect of adding emulsifier and multienzyme in diets containing rapeseed meal with different energy levels on performance, intestinal morphology and digesta viscosity in broiler chickens The effect of adding emulsifier and multienzyme in diets containing rapeseed meal with different energy levels on performance, intestinal morphology and digesta viscosity in broiler chickens 369 389 99613 10.22059/ijas.2024.379324.654020 FA Sepideh Gazani Department of Animal Science, College of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran Mansour Rezaei Department of Animal Science, College of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran Mohammad Kazemi Fard Department of Animal Science, College of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran Journal Article 2024 07 29 In a 2×2×2 factorial experiment, the effect of two levels of multienzyme Vemozyme (0 and 0.01%) and two levels of emulsifier (0 and 0.05%) in a diet containing rapeseed meal with two levels of energy (recommended and 100 kcal lower than the recommended level) on performance, intestinal morphology and digesta viscosity in 800 Ross male broilers chickens were investigated for 42 days. Usings enzyme in the starter, grower and the whole period of the experiment, improved feed conversion ratiovillus surface areaand reduceddigesta viscosity in the jejunum and ileum. Adding e emulsifier to diet improved feed conversion ratio in the starter, finisher and the whole period and increased the villus length and decreased digesta viscosityin the jejunum. Recommended energy level improved feed conversion ratio in the grower, finisher and the whole period of the experiment, and increased the villus length in the duodenum. The three interaction effects of enzyme and emulsifier in the diet with low energy level in the finisher and the whole period, compared to diets with the recommended level of energy with enzyme or emulsifier had not significant effect on feed conversion ratio. The results of the present experiment, showed that use of multienzyme, Vemozyme and emulsifier in diets containing canola meal, with low energy level improved feed conversion ratio in the finisher, and whole periods, increased the villussurface area and reduceddigesta viscosity in thejejunum. In a 2×2×2 factorial experiment, the effect of two levels of multienzyme Vemozyme (0 and 0.01%) and two levels of emulsifier (0 and 0.05%) in a diet containing rapeseed meal with two levels of energy (recommended and 100 kcal lower than the recommended level) on performance, intestinal morphology and digesta viscosity in 800 Ross male broilers chickens were investigated for 42 days. Usings enzyme in the starter, grower and the whole period of the experiment, improved feed conversion ratiovillus surface areaand reduceddigesta viscosity in the jejunum and ileum. Adding e emulsifier to diet improved feed conversion ratio in the starter, finisher and the whole period and increased the villus length and decreased digesta viscosityin the jejunum. Recommended energy level improved feed conversion ratio in the grower, finisher and the whole period of the experiment, and increased the villus length in the duodenum. The three interaction effects of enzyme and emulsifier in the diet with low energy level in the finisher and the whole period, compared to diets with the recommended level of energy with enzyme or emulsifier had not significant effect on feed conversion ratio. The results of the present experiment, showed that use of multienzyme, Vemozyme and emulsifier in diets containing canola meal, with low energy level improved feed conversion ratio in the finisher, and whole periods, increased the villussurface area and reduceddigesta viscosity in thejejunum. https://ijas.ut.ac.ir/article_99613_11651ff27c2d67a314da4a31ad7b9eb9.pdf