Effect of Using Sesbania sesban and Its Mixtures with some Summer Fresh Grasses on Lambs Productive Performance in New Reclaimed Soil

The objective of this work was to study cultivation sesbania and its mixtures with sorghum or millet inreclaimed sandy soil, then utilization the green forages in feeding of growing lambs for 16 weeks in two stages (The 1stcut was fed in the 1st stage through the first 8 weeks and 2nd cut was fed in the 2nd stage through the last 8weeks).Twenty four Ossimi lambs averaged 22.5 kg body weight were divided into four groups (6 in each) to evaluatethe following rations: Ration A (control): 100% from requirements of CP according to NRC(1985) from ConcentrateFeed Mixture (CFM) + Rice straw ad lib., Ration B: 50% from requirements of CP according to NRC from CFM +Sesbania ad lib., Ration C: 50% from requirements of CP according to NRC from CFM + Sesbania-Sorghum mixture(1:1) ad lib. and Ration D: 50% from requirements of CP according to NRC from CFM + Sesbania-Millet mixture (1:1)ad lib. Digestibility trials were conducted to evaluate the experimental rations using 12 rams (3 in each). The rumenparameters were measured and forage yield was determined. Results showed that DM and CF% were lower and CP%was higher in Sesbania than Sorghum, Millet, Sesbania-Sorghum mixture and Sesbania-Millet mixture. The differencesamong all rations in digestion coefficients of DM, OM, CP, NFE and TDN% of tested rations were not significant. Theruminal parameters explained that the pH of control was significantly higher than other groups at all times in 2nd stage,while the differences among other groups were not significant. The differences of ammonia-N at 2hrs after feeding werenot significant among groups, while ammonia-N of control was significantly higher than other groups at 4hrs, and thedifferences among other groups were not significant at the same time. The differences number of TVFA's among groupswere not significant in 1st stage. The differences of protozoa at 4 hrs post feeding were not significant among all groups.The differences of microbial protein were not significant among all groups in the 1st stage. The highest cost value offeed consumption was recorded with control. The daily body gain(DBG) were 156.1, 150.3, 154 and 154.8 gm/h/d forlamb groups which fed rations A, B, C and D respectively and the differences of DBG among four groups were notsignificant. The best feed conversion and economical efficiency were recorded with ration D. The green forage yield ofSesbania pure, Sesbania-Sorghum mixture and Sesbania-Millet mixture were 10.85, 15.31 and 15.30 ton/feddan, dryyield were 2.22, 3.32 and 3.34 ton/feddan, and crude protein yield were 403, 451 and 478kg/feddan, respectively.