This study was conducted to demonstrate the effect of four levels of N-carbamylglutamate (NCG), 0, 2, 4 and 6 g /day /animal with or without 1% urea on feed intake, daily and total gain. The experiment was conducted in animal field of the holy Abbasid shrine in Karbala from 10/14/2019 to 12/24/2019, experiment period was 70 days preceded by an adaptation period of 10 days, 32 female Awassi lambs aged 3-4 months were used with initial weight 23.725 ± 0.478 kg divided into two groups, each group

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... as four treatments, first one fed four levels of NCG, 0, 2, 4 and 6 g / day without urea, while the second group was fed NCG, 0, 2, 4 and 6g/ day with 1% urea. Two-factor experiment (2 × 4) Completely Randomized Design was used for experimental treatments T1, T2, T3, T4, T5, T6, T7, T8. Results of adding NCG with or without replacing soybean meal with urea showed no significant differences in dry matter intake of roughage and concentrated feed, as well as, initial and final weight of the experimental animals (kg), in-vitro and in-vivo digestibility of dry matter, organic matter and nutrients (%). There were superiority of NCG treatments for feed efficiency compared to control, 12.63, 9.07, 8.66 and 8.81 for NCG treatments 0, 2, 4 and 6 g / day, respectively, and the efficiency of energy to daily gain, 0.42, 0.29, 0.27 and 0.27, respectively, and efficiency of crude protein intake /daily gain, 0.49, 0.33, 0.31 and 0.31 respectively, as well as the daily weight gain 90.89, 128.39, 132.5 and 131.07 (g /day) and total weight gain, 6.36, 8.99, 9.28 and 9.18 (kg) for NCG respectively. It can be concluded that urea can be substituted instead of soybean meal with addition NCG without negative effects on animal, as well as increasing feed efficiency, increasing daily gains and total weights, and improving the productive characteristics of Awassi lambs.