Determination of chemical composition digestibility of four rang species in S and B province.

Three range plant including convolvolus spinosus pennisetum divisum, Aeluropus macrostachys at Three growth stages (before flowering, flowering and before ripening) from Three sites in southern and central Baluchestan were collected and chemically analyzed. The digestibility of the samples was determined through the invitro .The concentration of DM, CP, EE, Ash, CF, NDF, ADF, Lig, GE, NFE, DDM, DOM, DOMD, ME of convolvulus spinosus before flowering were: 95.16, 6.00, 1.54, 5.53, 39.33, 51.13, 39.00, 10.66, 4/16( Kcal/gr), 47.89, 19.94, 16.43, 14.06 percent and 0/66 (Kcal/gr), and at flowering stage were: 95.49, 5.11, 1.41, 5.96, 41.80, 52.46, 40.33, 11, 4/15( Kcal/gr), 45.71, 16.46, 13.09, 10.61 percent and 0/56( Kcal/gr) and at before ripening stage were as follows: 95.55, 4.22, 1.19, 7.28, 42.00, 55, 40.66, 12.13, 4/18 ( Kcal/gr ), 45.30, 18.55, 13.63, 10.70 percent and 0/56 ( Kcal/gr) respectively. By increaseing the age of the plant the CP concentration had a significant decrease (P%5) but ash content and CF and Lig had a significant increase (P%5). The concentration of DM, CP, EE, Ash, CF, NDF, ADF, Lig, GE, NFE, DDM, DOM, DOMD, ME of Pennisetum divisum before flowering were: 96.40, 5.63, 1.58, 8.29, 40.66, 72.60, 43.46, 10.20, 4/14 Kcal/gr, 43.82, 31.89, 31.07, 25.68 percent and 1/03 ( Kcal/gr. at flowering stage were: 96.82, 5.29, 1.39, 8.08, 40.13, 73.40, 44.60, 11.06, 4/18 (Kcal/gr), 45.09, 33.81, 32.02, 26 percent and 1/ 05(Kcal/gr), and before ripening stage were: 97. 03, 5.06, 0.96, 8.97, 39.86, 71.46, 42.73, 10.26, 4/15( Kcal/gr) 40.55, 36.19, 34.44, 29.37 percent and 1/14(Kcal/gr) respectively. By increasing the age of the plant the DM concentration increased But CP and NDF significantly (P%5) decreased. The concentration of DM, CP, EE, Ash, CF, NDF, ADF, Lig, GE, NFE, DDM, DOM, DOMD, ME of Aeluropus macrostachys before flowering were: 97.13, 4.93, 1.12, 17.99, 30.86, 65, 37.46, 9.06, 3/47(Kcal/gr), 45.08, 42.48, 39.35, 30.02 percent and 1/1 7 (Kcal/gr) . at flowering stage were: 97.09, 4.69, 1.41, 18.04, 37.06, 45.26, 41.53, 9.80,.3/56 (Kcal/gr), 38.79, 43.35, 39.31, 31.12 percent and 1/21(Kcal/gr) and before ripening stage were: 96.97, 4.02, 0.94, 22.32, 32.46, 65.53, 38.46, 9.56, 3/41(Kcal/gr), 40.25, 42.71, 40.25, 30.65 percent and 1/19(Kcal/gr) respectively. There is a significant difference between the 3 growth stages in terms of CP, EE, ADF and NFE (P%5). The chemical analyses of the samples showed that there was a significant difference between the species studied in terms of all the factors except for EE. In this comparison there was a significant difference between growth stages in terms of CP and Ash, also in terms of ADF, Lig and NFE there was a significant difference. The mutual effect of species and stage was significant only in terms of CP.