Gorgan University of Agricultural Sciences and Natural Resources Poultry Science Journal 2345-6604 6 1 2018 04 01 Evaluation of Miswak(Salvadorapersica)asaHerbalAdditive in Broiler Chickens 89 97 4006 10.22069/psj.2018.14348.1304 EN M Houshmand Department of Animal Science, Faculty of Agriculture, Yasouj University, Yasouj, Iran M Nikouzad Shahraki Department of Animal Science, Faculty of Agriculture, Yasouj University, Yasouj, Iran MR Bahreini Behzadi Department of Animal Science, Faculty of Agriculture, Yasouj University, Yasouj, Iran Journal Article 2017 12 03 We determined the effects of dietary supplementation of different doses of Miswak (<em>Salvadorapersica</em>) steam and leaf powder on the performance, blood parameters, cecal flora, and carcass traits of broilers. Four hundred and eight one-day old Ross 308 broiler chicks were provided one of the following experimental diets over 42 days:  a basal diet without any additives, or a basal diet supplemented with 0.1%, 0.2%, 0.4%, 0.6%, or 0.8% Miswak powder. Four replicates of 17 birds were allocated to each treatment. Neither broiler performance (body weight gain, feed intake, and feed conversion ratio) during starter (d 1-21), finisher (d 22-42), and the overall period (d 1-42) of the study, nor blood parameters (glucose, triglyceride, cholesterol, high density lipoprotein-cholesterol, low density lipoprotein-cholesterol, and very low density lipoprotein-cholesterol) were influenced by experimental treatments (<em>P </em>> 0.05). Chicks fed diets containing 0.4% Miswak had higher (<em>p </em>< 0.05) cecal<em> Lactobacillus </em>than the control group at day 42. Furthermore, 0.6% and 0.8% Miswak reduced the number of cecal<em> E coli</em> compared to the control diet (<em>P </em>< 0.05). There were no significant differences in carcass yield and the relative weights of thigh, breast, and abdominal fat at day 42 (<em>P </em>> 0.05). In conclusion, we found that supplementation with Miswak powder had no beneficial effects on performance and blood parameters of broilers, but could improve cecal bacteria counts at levels greater than 0.4%. https://psj.gau.ac.ir/article_4006_08a289248974cae5f6068310acba02ca.pdf