Comparison of Phenological Stages on Forage Quality of Rangelands Species in Rangeland of Saral Kordestan

In order to study of phenological stages on forage quality, 19 species of vegetation were selected. These species are palatable and important in Rangelands of Saral Kordestan. Samples were collected in three phenoligical stages of vegetative growth, flowering and seed production. Plant samples were analyzed to determine N percentage as well as Acid Detergent Fiber (ADF). In order to analyze of data, using split plat statistical method with randomized complete design in 3 replication of 57 treatment for each location. According to the phonological stages of growth had a significant influence on forage quality. In all species, the amount of CP, DMD and ME decreased with progressing growth stages, while ADF contents increased. The results are important to determine suitable time for grazing and estimation of grazing capacity in rangeland of Saral.