![]() | Only 14 pages are availabe for public view |
Abstract The effect of biological treatments on chemical composition, fiber fraction and in vitro digestibility was evaluated. In vivo digestibility, nutritive value and N- balance were also evaluated. The effect of biological treatments on rumen fermentation and some blood parameters were also determined. Two experiments were carried out; the first was in vitro preliminary study in which the best combination of the tested microbes along with the best condition of cultured microbes was tested. The second was an in vivo digestibility and nitrogen balance study in which six experimental rations were investigated using 4 sheep in each. The main results of these experiments were: 1- The best combination of the used microbes was the quadruple (GDYB) which gave the best results in comparison with the single, double and triple combinations. 2- The DM, OM and CF contents decreased with the biological treatments. 3- The biological treatments increased CP, EE, NFE and ash; they also increased as the combined number of microbes increased. 4- Biological treatments decreased cell wall constituents especially cellulose. 5- Increasing media levels improved the DM and OM contents and their in vitro digestibility. 6- Decreasing the media substrate from 5 to 2g improved the chemical composition and IVDMD and IVOMD. SUMMARY AND CONCLUSION 131 7- Increasing the incubation time from 1 to 4 weeks caused an increase in chemical composition and in vitro digestibility. 8- The treated rations (T3 and T6) increased apparent digestibility of the experimental rations (P<0.01) for all nutrients than the untreated ones. 9- The biological treatment increased digestibility of DM and OM by about 10 units. 10- Digestion coefficients of CP were 46.47, 48.21, 60.11, 40.71, 45.33 and 55.56% for T1, T2, T3, T4, T5 and T6, respectively. 11- The biological treatment improved digestibility of all fiber fractions by about 10 units especially with the 40% roughage ration; it improved from 51.23 to 59.4% for NDF; from 40.11 to 50.35% for ADF; from 49.29 to 58.51% for CEL; from 58.7 to 65.14% for HEM. 12- The lower roughage rations (T1, T2 and T3) had better digestibility of all nutrients than the higher roughage ones (T4, T5 and T6). 13- The biological treatment improved the TDN by about 9% and 8% for T3 and T6, respectively. Values of DE followed the same pattern. 14- The biological treatment also increased DCP by more than 44% (from 4.99 to 7.21%) in the low roughages ration and more than 83% (from 3.61 to 6.62%) in the high roughage ration. 15- Nutritive values increased as the roughage level in the diet decreased. |