Abstract
This study included tow experiments, The first was digestion trail conducted by using nine Awassi lambs with average body weight 50.92 kg and 10-12 months of age were distributed randomly according to there body weight into three groups .Lambs in each group fed individually and ad lib. on ration consisted mainly of barley, wheat bran, and soybean meal contained 14.5% crud protein ( control T1) . While the second and third rations ( T2 and T3 ) contained 14.5 and 16% protein respectively after been treated 75% of barley and wheat bran with formaldehyde. The second experiment was conducted by using 15 Awassi lambs with average body weight 26.55 kg , 5-6 months of age . The lambs were divided into three groups each of (5) and fed individually on the three rations under investigation for 70 days. Results of Expt 1. showed that there were no significant differences between treatments in nutrient coefficient digestibility, with exception ADF digestibility was significantly ( P < 0.05 ) increased in T3 50.96% as compared with T1 36.44% . Also it was noted that there was a significant (P < 0.05) increase ether extract digestibility in T2 and T3 83.97 and 83.90% respectively as compared with T1 54.97% . Results indicated that the treatments had no significant effect on rumen liquor pH and ammonia concentration before and after feeding . Blood triglyceride concentration was significantly ( P < 0.01 ) increased in T2 and T3 29.52 and 32. 73 mg/100 ml as compared with T1 20.28 mg/100 ml . Results of Expt 2. showed that the treatments had no effect in dry matter intake, average daily gain , feed efficiency and dressing percentage . however , chemical analysis of meat showed a significant ( P < 0.05 ) increase in meat protein percentage 17.06% in T3 as compared with T1 and T2 15.39 and 15.04% respectively
