الفهرس 
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Abstract
This study was carried out to visualize the impact of giving three iso-energetic ( 76% TDN) heteronitrogenous ( 14,16 and 18 CP% levels) free choice creep feed (lamb starter) on growth performance, selected serum parameters and some immune parameters in fattening Barki lambs during 12 weeks experimental feeding trial until weaning, in comparison to the traditional feeding management technique. In order to determine the best protein level that should be included in commercial creep feed for suckling Barki lambs to achieve the best performance. Prior to the feeding trial and during the preliminary period we will conduct many trials to determine the best diameters (tall and width) of specifically designed feed mangers that will be suitable for suckling Barki lambs that permit the access of the young suckling lambs to the creep feed and prevent the dams. Sixty Barki lambs,with an average live body weight 6-9 kg and 21-23 days age were randomly assigned to four feeding groups (each of 15 lambs) in separate pens. Lambs in all groups suckled their dams until being weaned at 12 weeks of age (natural weaning). Lambs in the first group depended completely on dam’s milk as a solely available feed and served as (control), while lambs in the other three groups were given three iso-energetic heteronitrogenous free choice creep feeds placed in specially designed creep feeder in each pen. Lambs in the second group were given creep feed with 14% Cp, while lambs in the third and fourth were given creep feeds with 16% and 18% cp levels respectively. lambs in all groups had ad libitum access to clean water. Results of the first trial revealed that a simple wooden design feeder of a 20 cm width and 120 cm tall were proofed to be the most suitable diameters for the creep feeder of the parki lamb breed. Results of the second trial showed that creep feeding to lambs is beneficial in terms of increasing final live weight (16.23 ± 0.23 vs 22.43 ± 0.59, 23.93 ± 0.88 and 25.07 ± 0.52 kg) and the average final weaning weight gain (8.96 ± 0.31 vs 14.82 ± 0.60, 15.90 ± 0.76 and 17.36 ± 0.59 kg) for control, second, third and fourth groups respectively. Also results in better feed conversion ratios regarding to the amounts of concentrated feed consumption (6.060, 5.452 and 5.382) for the second, third and fourth groups respectively. Concerning blood parameters data indicated that serum variables of are within the normal values reported in literature, a situation that embraces the normal and good health status of the lambs, however the results of hemoglobin (HB), RBCs and blood glucose levels that were significantly elevated as a result of the use of creep feed in comparison to those of the control group. On the other hand there were no significant difference in the liver function tests (Alanine aminotransferase (ALT), and aspartate aminotransferase (AST), kidney function tests uric acid, urea, creatinine as well as total proteins, albumin, globulin and A/G ratio. A condition that can doubtless affect the lamb performance in a positive manner and might indicate the increasing rate of metabolism of creep supplemented lambs along the whole experimental period. In addition The obtained data revealed an increase of Phagocytsis activities ( 40 vs 40.7,43.4 and 45% and the Phagocytic indices ( 2 vs 2,2 and 2.7) for control, second, third and fourth groups respectively.it is to be concluded that creep feeding young lambs while still nursing the ewe can provide valuable supplemental weight gain. This added weight gain has the most economic value for lambs managed in an intensive, early weaning production system.