This research was conducted in a private slaughterhouse in Samarra from 1/5/2019 to 1/8/2019. Sixteen Awassi lambs were raised with an average body weight (of 20±25) kg and an age of about (5.5 to 6) months. We divided the lambs into four treatments. The first treatment was without additives, called control; the second treatment was 1% Sumac, the third treatment was 3% Sumac, and the last one was the fourth treatment with 5% Sumac. The results showed significant differences between treatments in biceps femoris and semimembranosus muscle (treatment 3 the female) were (180.9±10.66)g, ( 168.4±5.72)g respectively. And a highly significant difference in adductor muscle (treatment 3, the female) was (75.6±2.58)g compared with the control (62.85±5.93)g. significant differences in treatment 3 in Semitendinosus muscle between males and females were( 57.2±3.65) and (74.4±3.02)g, respectively. The rectus femurs showed significant differences between treatments 3 and 4 in females were( 99.6±8.76) and (76.3±6.98)g, respectively. In physical dissection, a low significant difference in treatment 4 in lean was (56.3+3.66)%. The lean percentage in treatment 3 of the female was (59.2±0.99) %. About chemical analysis, the high percentage of moisture in the male in treatments 2,3 and 4 were (72.7±0.14),( 72.8±0.21),(and 72.8±0.21)%, respectively. Keywords: leg cut, physical dissection, Rhus Coriaria L.

This research was conducted in (Good land farm and factory) for meat processing in Samarra in cooperation with Nature Resources Center in Tikrit University. to the period from 1/5/2019 to 1/8/2019. Sixteen Awassi lambs were used in this research average body weight (20 ± 25) kg abought (5.5-6) months. the lambs was divided into four treatments according to Sumac additives : Treatment one was control without Sumac, treatment two 1% Rhus powder, treatment three it was 3% Rhus powder and treatment four was 5% Rhus powder. Ther results showed significant differences in live weight treatment four(42.38 ± 1.73)kg was higher than the other treatments were ( 38.16 ± 1.50)kg (36.64 ± 1.04)kg (34.63 ± 1.53)kg respectively. Significantly was noticed in treatment four than other three treatments in empty body weight, hot and cold carcass weight and dressing percentage. About the main cuts of right half of the carcass, leg cut in treatment four conducted significant differences (3.08 ± 0.12) than other treatments were ( 2.47 ± 0.22)kg (2.45 ± 2.02)kg (2.52 ± 0.10)kg respectively. Loin showed significant differences in treatment four(0.92 ± 0.01)kg compared with control was (0.63 ± 0.07)kg and treatment three (0.67 ± 0.01)kg shoulders and ribs did not recorded significant differences between four treatments. For secondary cuts of right half cuts, fore shank of treatment two was the lowest (0.64 ± 0.029) compared with other treatments were (0.75 ± 0.002)kg (0.68 ± 0.38)kg (0.76 ± 0.023)kg respectively while breast, neck and flank did not recorded significant differences between treatments. Abdominal fat was the highest in treatment four (0.24 ± 0.03)kg while the values in the res treatments were ( 0.08 ± 0.02)(0.17 ± 0.03)(0.07 ± 0.07)kg respectively. kidney and pelvic fat also was high in treatment four (0.26 ± 0.87)kg than other treatments. Finally, rib eye area was conducted high significant differences in treatment four was (10.404 ± 0.302)mm compared with the other three treatments were(7.701 ± 0.503)mm(6.650 ± 0.155)mm(8.752 ± 0.454)mm respectively.