Using Different Types of Yeast Cell Extract, Probiotic and Abiotic to Improve Growth Performance, Carcass Characteristics and Antioxidant Activities of Broiler Chickens

the purpose of this study was to investigate the effect of yeast probiotic, abiotic, and extract on the growth, carcass characteristics and antioxidant activity of broiler chickens. a total of 210 day-old chicks ( Ross-308) , were used in this experiment and were randomly assigned to 7 treatments .Each treatment involved 3 replicates and were housed in 21 pens with 10 birds per pen (replicate). The following treatments were: T1 is the control treatment; while T2 and T3 added with yeast extract, T4 and T5 added with probiotic yeast while,T6 and T7 having abiotic yeast. All of previous treatments added in drinking water with two concentrates 1 and 2% , respectively during 1st 3 days of age . Broilers having yeast extract and probiotic causing significantly higher body weight gain (BWG) during growing period and also it has lower feed intake (FI) and better feed conversion rate (FCR) than others in different groups during all periods of experiment. Carcass weight , dressing and spleen % in probiotic yeast groups tended to be heavier than birds in other treated groups and also when compared with the control group . Total antioxidants capacity (TAC) , catalase activity (CAT) and Superoxide dismutase (SOD) levels were significantly higher in all treated groups compared with control group. Also, malondialdehyde (MDA) value was significantly (p > 0.05) reduced in groups receiving yeast and lowest value recorded in yeast extract compared to control group. It is concluded that adding yeast extract and probiotic yeast during 1st 3 days of age could improve growth performance , carcass characteristics and total antioxidant capacity of broiler chicks.