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There are 1263000 hectares’ rangeland in Bushehr province which there is little information available about nutritive value of those forages. This research was carried out in order to determine nutritive value of three dominant and important range plants and its variations along the growth stages in Bushehr province. For this, sampling of each plant carried out randomly from three rangelands and three growth stages including vegetative, flowering and seeding. Samples were dried and ground and one sample of each area at each growth stage was used for determining Dry matter (DM), Crude protein (CP), Ash, Ether extract (EE), Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF), Acid Detergent Lignin (ADL), Gross Energy (GE), Ca, P, K, Mg, Na, Fe, Mn, Zn, Cu, Dry matter digestibility (DMD), Organic matter digestibility (OMD) and Dry matter in Organic matter digestibility (DOMD). According to results, with advancing growth the CP, P, K, DMD, OMD and DOMD of plants significantly (p<0.05) decreased and except of P. divisum, NDF and ADF significantly (p<0.05) increased and ADL of P. divisum and M. parviflora also significantly (p<0.05) increased. Plant species had significant effect (P<0.05) on CP, Ash, NDF, ADF, ADL, DMD, OMD and DOMD and all minerals at all growth stages except of Na at seeding stage and Mn at flowering and seeding stages M. parviflora had the highest CP, Ca, K, Mg, Fe, Cu, Zn, DMD, OMD and DOMD content and the lowest NDF and ADF among plants at all growth stages. Concentrations of Ca, K, Mg, Na, Fe and Mn of plants at various growth stages were higher than those critical levels, but P, Zn and Cu contents at some stages were less than these levels. Therefore, it is concluded that among these three species, M. parviflora was the best species and vegetative stage had the most suitable contents of chemical composition, minerals and digestibility. Key words: Chemical composition, Minerals, Digestibility, Range, Bushehr province
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