الفهرس 
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Abstract
The present study was conducted at the Animal Production Farm; Agricultural Researches and Experiments Center; Faculty of Agriculture, Mansoura University, from July 2007 to January 2008. The present study aimed to investigate the effects of partially or totally replacing corn dried distiller’s grains with soluble (DDGS) instead of soybean meal (SBM) and corn in the diets of growing lambs (¾ Romanov ×¼ Rahmani) on their growth performance, feed intake, digestibility, nutritive values, rumen liquor traits, some blood plasma constituents, feed cost and economical efficiency. Four groups of lamb (each of 5 animals) were fed four dietary treatments having roughage: concentrates ratio 40: 60. The DDGS was included in the concentrate feed mixtures (CFM) at 0.0, 10, 15, and 20 % instead of corn and SBM. The obtained results could be summarized as follows All the total mixed diets had approximately equal values for chemical nutrients, except that of NFE content. The fiber fractions; NDF and cellulose were positively correlated with elevating DDGS level in the diets. The NFC was decreased gradually as DDGS level increased in the diets. The inclusion of DDGS in lamb diets at any level had positive effects on digestibility coefficients of all nutrients in comparison to the control group. The DDGS-contained diets had better values of TDN % and DCP % than the control. The DE, ME and NE concentrations (kcal/kg DM) were better for all DDGS-contained groups than the control group (T1). Ruminal pH values slightly changed among treatments. The same trend was found also for NH3-N (mg/100 ml). The VFA’s concentrations (meq/100ml) was increased (P≥0.05) with including the DDGS in the diet. The sampling time had significant (P ≤ 0.01) effects on all rumen liquor parameters studied. The inclusion of DDGS in lamb diets at any level had almost positive effects on plasma TP, A, G, creatinine, AST and ALT values than the control. Live body weights of T1, T2 and T3 groups were not obviously different throughout the feeding period); however, the lambs of T4 were the heaviest among all groups after 4 weeks of feeding until the end of the experiment.. After 24 weeks of feeding, the lambs of T3 and T4 showed better values of ADG than the control group by about 11.0 and 17.7%, respectively. The lambs of T4 (20% DDGS) consumed more DM throughout the experiment than all other experimental groups. The inclusion of DDGS in the diets had positive effects on the intake and conversion of NFC, TDN, DCP, DE, ME and NE. The economic efficiency values were gradually improved with elevating the DDGS level in the diet from 0.0 up to 20% replacing corn and SBM. It may be concluded that in general, the inclusion of DDGS instead of corn and SBM at any level ranging from 10 to 20% of CFM DM resulted in better performance, feed utilization and economic efficiency. Therefore, the lamb keepers can be advised to include DDGS in lamb diets throughout the growing and finishing phases at 20% of DM to obtain better results and more net return.