| Abstract: |
The present study was conducted at the department of Animal Production, Faculty of Agriculture, Zagazig University, Zagazig, Egypt. The practical work was carried out at sheep farm belongs to Animal Nutrition Research unit, Radiobiology Applications Department, Nuclear Research Center, Atomic energy Authority, Abu Zabeel, Qaluobia Governorate to investigate the effect of chemical and biological treatment of rice straw on performance of male lambs, nutrient digestibility and some blood chemical constituents. Twenty-eight Barki male lambs with average initial live body weight of 31.75 kg and about five month of age were divided into four similar groups. The first group (T1, control) fed concentrate feed mixture (CFM) and untreated rice straw, while the second group (T2) fed CFM and berseem hay (BH). The third and fourth groups (T3 and T4) fed CFM plus either chemical treated rice straw or biological treated rice straw, respectively. All nutrients digestibility showed higher (P<0.05, 0.01 or 0.001) values with T2, T3 or T4 diets as compared with T1.The improvement in the digestibility for CP were 46.88, 38.64 and 41.50%, CF were 18.33, 24.46 and 33.02%, EE were 8.97, 22.40 and 6.25%, NFE were 14.44, 14.30 and 10.14%, respectively for T2, T3 or T4 when compared with the T1. The nutritive value as TDN were the highest for lambs groups fed T2, T3 or T4 diets with 16.17, 15.99 and 14.17%, respectively when compared with the T1. The corresponding values of DCP percentages were 29.22, 25.60 and 30.03%, for T2, T3 or T4, respectively. Average daily gain of lambs in T2
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