Comparative Study on Chemical Composition and Degradability of Raw and Processed Aspen and Grape Vine Woods

This study was carried out to compare nutritive value of raw and processed aspen and grape vine wood. Chemical processing of the woods was done with NaOH 5%. For this purpose 4 fistulated holstein steers with 500±50 Kg live weight was chosen in a completely randomized block design with 4 treatments (raw aspen، processed aspen، raw grape vine and processed grape vine) and 4 animals as replicates. Data was statistically analyzed using ANOVA model and mean treatment values were subjected to duncan multiple test. All steers were fed a diet containing chopped alfalfa hay and ground barley at maintenance +10% of maintenance requirement level. Diets were fed to steers twice a day in equal portions. The disappearance rate of DM was measured in hours 4، 8، 12، 24، 48، 72. Results of this study indicated that disappearance of DM for raw aspen was 2. 964، 4. 548، 3. 648، 6. 249، 8. 284، 9. 678، 8. 393، 6. 291 percent، for processed aspen was 21. 68، 23. 31، 24. 95، 36. 58، 47. 11، 54. 31، 57. 07، 57. 88 percent، for raw grape vine was 8. 685، 9. 488، 10. 50، 13. 32، 15. 43، 14. 18، 14. 01، 8. 466 percent، and for processed grape vine was 24. 82، 27. 15، 29. 69، 39. 14، 45. 31، 49. 15، 52. 32، 52. 89 percent respectively. Degradability values of raw aspen، processed aspen، raw grape vine and processed grape vine for the factor a (soluble fraction) was 1. 51، 15. 68، 5. 75، 20. 55، for the factor b (insoluble fraction) was 6. 71، 45. 45، 7. 35، 33. 11 and for the factor a+b (degradable fraction) was 8. 21، 61. 12، 13. 10، 53. 66 percent، respectively. Effective degradability of out flow rate for %3 was 5. 8، 36. 1، 11. 5، 37. 1، respectively. The result of chemical composition analysis showed that processing with NaOH had considerable decrease in amount of cellulose، hemicellulose، lignin، NDF and ADF. It may be concluded that chemical processing of the woods with NaOH 5% has positive effect on nutritive values of the woods.