To find out effects of adding ginger roots powder and vitamin E and mutual synergy between them on productive performance and some carcass features of Awassi lambs. An experimement was conducted at animal farm designated for raising sheep of the Department of Animal Production/College of Agriculture and Forestry, University of Mosul. Twenty-four of Awassi lambs (males) were selected homogeneously with average of initial weight (27.250- 27.525 kg) and close in age (5.5-6 months) at the beginning of experiment. The fattening diet was prepared as a peleted ration free of feed additives (control diet).While ginger roots powder was added at a rate of 20 gm/kg dry matter to the second ration and vitamin E was added at a rate of 200 mg/kg to the third diet's components.As for fourth treatment a mixture of 20 gm of ginger roots powder and 200 mg of vitamin E was added to concentrate pelleted. The lovable concentrated diets of Awassi lambs were provided with uniform protein level (15.59%) and metabolize energy level (2750 Kcal) during fattening period (90 day). The current study found that lambs treated with the experimental treatments had significantly higher rates of final weight, daily gains, and total weight than lambs treated with the control treatments. The rates of final weight were 45.475, 48.167, 49.410, 51.512 kg, daily weight gain was 199, 232, 244, 268 gm/day and total weight gain was 17.983, 20.917, 21.978, 24,205 kg/head for four treatments respectively. In terms of carcass features, the results demonstrated a highly significant improvement (P≤0.01) on an averages of hot and cold carcasses weights was in favor of lambs treated with ginger, vitamin E, and a synergistic treatment between them as compared to lambs given with a control treatment. The averages of hot carcass weights were 20.983, 24.545, 25,711, 27.580 kg, and cold carcass weights were 20.515, 24.177, 25.325, 26,994 kg for four treatments respectively.While the current study found a substantial superiority (P≤0.05) on rates of ocular muscle area and significant decrease on fat under skin thickness which was comparison to the control group.

| Three treatments each with fifteen of Awassi lambs (5-6 months aged and weighted 22.30 -24.60 kg) fed on three rations for 100 days period were used. The rations was iso levels of crude protein (13.65, 13.75, 13.85%) and iso caloric (2597, 2545, 2506 K cal /kg, while were varied in proportion of tea waste (0, 7.5, 15%) respectively. The results showed high significant differences (P≤0.01) between three treatments in rates of final weight and significant differences (P≤0.05) in average of daily weight gains. As for slaughtering processes of lambs, the results appeared high significant differences (P≤0.01) between three treatments on average of hot and cold carcass and significant differences (P≤0.05) in rates of muscle area, between three treatments. While in separates fats the results shown significant differences (P≤0.05) in averages of tail fat, total fats percentages between first treatments than for third treatment. As for blood traits, the results of the statistical analysis was indicated that there were a significant differences (P≤0.05) in rates of concentrations of total protein, triglycerides, cholesterol and highly significant (P≤0.01) in rates of albumin concentration between first treatment than third treatment in blood serum of Awassi lambs groups. The results concluded the possibility for using dried tea waste as a protein source in the components of fattening rations of local sheep and there was no negative effect on productive performance, carcass characteristics and blood traits. citation | Almahdawi M (2018). Using tea waste as a source of protein in the ration and its impact on productive performance, growth and some blood parameters of awassi lambs. Adv. Anim. Vet. Sci. 6(11): 499-508. doI | http://dx.