%0 Journal Article %T Effects of Stiking Assa (Ferula assa foetida) powder on performance, immunity status and cecal microbial population of broiler chickens %J Iranian Journal of animal Science %I پردیس کشاورزی و منابع طبیعی دانشگاه تهران %Z 2008-4773 %A Shadmani, Mohammad %A Bagherzadeh Kasmani, Farzad %A Mirzaee, Hamid Reza %A Mehri, Mehran %D 2015 %\ 06/22/2015 %V 46 %N 2 %P 111-118 %! Effects of Stiking Assa (Ferula assa foetida) powder on performance, immunity status and cecal microbial population of broiler chickens %K Broiler Chickens %K feed conversion ratio %K Ferula assa foetida %K humoral immunity %K lactobacilli %R 10.22059/ijas.2015.55641 %X This research was conducted to evaluate the effects of adding five levels of Ferula assa foetida powder (0, 0.25, 0.50, 0.75 and 1 percent of diet) on performance, humoral and cellular immune status and cecal microbial population. A total of 200 one-day-old mixed sex Ross 308 broiler chicks were randomly assigned to 5 experimental groups with each four replicates and 10 birds in each replicate, using to a completely randomized design. Experimental periods were as 1-21 and 22-42 days of age. During 22-42 days of age, the highest body weight gain (BWG) was observed in birds fed diet containing 0.75% Ferula assa foetida (FAF). At 1-21 days of age, adding FAF to the diet did not affect FCR (P>0.05) but at 22-42 days of age the lowest FCR was observed in birds fed 0.75% FAF compared to control group (P<0.05). Birds fed FAF, had higher antibody titer against NDV, IB and cellular immunity 48h after challenging with 2,4-Dinitrochlorobenzene (P<0.05). Birds fed 0.75 percent FAF, had higher relative bursa of Fabricius weight compared to birds in control group (P<0.05). Cecal lactobacilli population improved by using FAF in diet (P<0.05). Result of this experiment showed that using 0.75% FAF powder in diet of broilers could improve FCR, humoral and cellular immune responses as well as cecal lactobacilli population. %U https://ijas.ut.ac.ir/article_55641_9ac2710f3baa7365dfeff5f6e9b3b1a4.pdf