Sixteen Abou-Delik male lambs, of an average live body weight 22.3 ± 3.02 kg and aged three months were used in this study to assess the effect of intensive and semi-intensive management systems on growth performance, carcass traits and economical efficiency. Lambs were randomly divided into two symmetric groups (eight lambs each) and allocated to different management systems. Lambs of group one (G1), were represent intensive management system, while, lambs of group two (G2), considered as the

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... emi intensive management system, The experiment was lasted for 180 days. At the end of experimental period, fourteen lambs were slaughtered and different carcass data were collected. Analysis of variance indicated that no significant difference (P< 0.05) were found between the intensive and semi intensive management systems in relation to final live body weight (37.63 kg vs. 36.88 kg), total live body weight gain (15.31 kg vs. 14.54 kg) and average daily gain from weaning age up to 9 months of lambs age (84.1 gm vs. 79.9 gm), respectively and live body morphemetric measurements of Abou-Delik lambs. There was a marked highly significant effect (P < 0.01) of management system and period on feed conversion ratio. Highly significant differences (P <0.001) between the two management systems. Feeding cost per head per day were LE 7.14 and LE 4.49 for the intensive and semi-intensive system, respectively. Benefit/Cost ratio were LE1.25 and LE2.26 for lambs at 6 months of age and 0.42 and 0.46 for the corresponding indicators at 9 months of age. Gross margin estimates were LE 156.5, 451, -390.7 and -243 for G1, G2 at 6 and 9 months of age, respectively.