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 has 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.

P eppermint, Mentha piperita or Mentha balsamea wild, and rosemary, Rosmarinus officinalis, are evergreen perennial shrub, were widely used in medicinal products, with large medical bioactive compounds, like menthol, menthone, isomenthone, eriocitrin, phenolic compounds (Sokovic et al., 2009; Hussain et al., 2010). In addition, leaves and oil of mint family used in food as flavorings and food seasoning, to contain volatile aromatic oils. These plants with fibrous roots are cultivated in many drought areas with lack of water for long periods, so, it's important plants in subtropical climate. Civilizations of Mesopotamia and Nile valley were the first of using in medicine. These phytogenic additives and phytochemicals contain camphor, salicylate, kaifik, yurosolic and butylonic acid, antioxidants such as karnosic acid, rosmarinic acid and carnosol (Hassan et al., 2014). During grazing, animals' ad-libitum feeding peppermint and rosemary or others medical plants, there for, ruminant exposed to many phenolic compounds, like tannins, lignin and other metabolites like saponins. These aromatic plants have essential oils (derived components) which aren't poison (FDA, 2004), active against many gram-positive or negative bacteria by interfering with permeability of cell membrane causing intracellular leakage (Trombetta et al., 2005), in order to the possibility of adaptation of rumen microflora, bioactive compounds in peppermint or rosemary suppressed the growth human viruses, so, it may have negative effect against rumen microorganisms. Thus, the aim of the following research was to determine the impact of peppermint and rosemary dried leaves, watery, alcoholic and organic extractions in rumen digestibility.

The experiment was investigated the effects of degradability crude protein on some blood parameters of ruminants, two experiments were conducted for three sources dietary crude protein: Soya, whey protein and urea. First experiment, soya was replaced with whey protein, while second experiment, soya was replaced with urea. Fifteen male lambs were used for each experiment and randomly distributed to five treatments T1, T2, T3, T4 and T5. Concentrated was fed at 3% of body weight as DM basis, while alfalfa was fed ad-libitum. Jugular blood was sampled from lambs after 90 days of experiment before feeding morning. Results of replacing soya with whey protein showed decreased blood protein and cholesterol, while, blood urea was increased and blood glucose had a linear increase with increasing whey protein intake, 45.75, 48.5, 52.5, 66.0 and 89.75 mg/dl for T1, T2, T3, T4 and T5. In second experiment, the results of replacing soya with urea showed decreased blood glucose and cholesterol for 2% urea in contrast with control, while blood urea was increased for 2% urea 36.11 mg/dl in contrast with 22.73mg/dl for control. In concluded, feeding high soluble crude proteins, decreased cholesterol and increased blood urea nitrogen.