journal of kerbala university

Thirty individual Awassi male lambs weighing 25.97 kg and 5-6 months of old were used ,to test the effect of using four levels (0 , 20 ,40 ,and 60 g /kg DM) of Iraqi probiotic in the fattening diets on changes in body weight and carcass gain . At the beginning of the experiment ;Six lambs were randomly allocated to each of the four diets ; the remaining ( six lambs) were slaughtered to provide data to relate empty body weight (EBW), hot and cold carcass weight and physical dissected gain to initial body weight. Lambs in T1 group were fed diet with no probiotic . Lambs in T2 T3 and T4 groups were fed on diets supplemented with 20 , 40 and 60 g/kg DM of Iraqi probiotic respectively .Daily nutrients intake were similar across treatments. Live weight gain slaughter weigh, hot and cold carcass weights , Empty body weight and Killing –out proportions of lambs fed diets supplemented with probiotic were significantly higher (p<0.01) than those fed control diets . However, higher improvement was achieved by lambs fed diet contain 40g/kgDM probiotic (T3). Physically dissected gain ,clearly indicated that supplementation of diets with probiotic approximately doubled the weight of lean gain (p<0.01) and slightly increased the weight of fat and bone gain (p<0.05) as compared with those fed control diets . Physically dissected lean : fat ratio was significantly (p<0.01)greater for lambs fed supplemented diets with probiotic than for those fed control diet (without probiotic) .