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The current study examined the effects of probiotics (Pronifer and More-yeast)supplementation to growing lambs. 25 crossbred (Osimi×Rahmani) growing lambs of about6–8 months age and an average initial live body weight of 25 kg were used. Lambs dividedinto five groups (5 lambs for each group) and the experimental period lasted for 169 days.The control group T1 received concentrate feed mixture (CFM), group T2 and T3 received 1.5and 3 kg Pronifer/Mg (megagram) CFM and group T4 and T5 received 2.5 and 5 kg More-yeast/Mg CFM, respectively. Rumen liquor and blood samples were taken and digestibility trialwas conducted at the end of the experiment. Results showed higher digestibility valuesfor crude protein (P<0.05) in T3 and T4 when compared to control. Nutritive ratio was lower(P<0.05) in groups T3 and T4 than in group T2. More-yeast supplementation improved drymatter intake (P<0.001), while a reverse trend was observed with Pronifer supplementation.All treatments had little effect on ruminal liquor except ruminal ammonia concentration in T5was lower (P<0.05) than other treatments. The differences in most blood plasma parametersdue to treatment effect were not significant, except plasma urea and globulin concentrationsincreased (P<0.05) with T5 treatment. The obtained results appear to indicate that Moreyeastsupplementation improved lambs performance and digestibility, whereas, Pronifersupplementation enhanced digestibility

Effect of growth promoters (probiotics) supplementation on performance, rumen activity and some blood constituents in growing lambs