چکیده:
For determination of grazing capacity, information of forage quality is essential which is influenced by various factors. The main objective of this research was investigation on effects of species, phenological stages, and life form on values of forage quality indices of six range species. Species were two grasses (Bromus tomentellus and Dactylis glomerata), two forbs (Ferula ovina and Coronilla varia) and two shrubs (Salsola rigida and Artemisia aucheri). Samples were collected from two highland ranges of Gachsar and Vard Avar. They were dried, grained and analyzed in Laboratory. The results showed that forage quality indices values including crude protein (CP), acid detergent fiber (ADF), dry matter digestibility (DMD) and metabolizable energy (ME) were significantly differed among species, phenological stages, and life forms (P<0.01). For all species CP, DMD, and Me decreased and ADF increased with plant growth development. Considering forage quality indices values among six species, C. varia had highest forage quality. Among life forms, forbs, higher forage quality obtained from forbs. In terms of growth stage, vegetative growth stage had better forage quality.
خلاصه ماشینی:
In rangelands with high plant diversity including various life forms of grasses, forbs and shrubs because of differences of spices phenology change of physical and chemical components are not similar among species and life forms.
So the main objectives of present research were investigation on effects of life forms, growth stage and species on variation of quality indices.
Methods The main objectives of this research were investigations on effects of phenological stages and life forms on range forage quality.
Samples from six range plant species in three phenological stages of vegetative growth, flowering and plant maturity were collected.
Forage quality of species between growth stages and life forms were compared using One Way Analysis of Variance (ANOVA) based on complete random design.
Mean of forage quality indices (CP%, ADF%, ME MJ/kg DM and DMD%) in different phenological stages (P<0.
Average quality indices values (CP%, ADF%, ME MJ/kg DM and DMD %) in three life forms of grass, forbs and shrub 4.
Zohdi (2001), Kaboli (2001), Ahmadi (2003), found that forage quality is affected by species.
Changes in chemical composition of six range species during growth period showed that phenological stages had significant effects on forage quality of rangelands.
This is similar to finding of other researchers such as (Vallentine 1990, Van Soest 1991, Torkan 1999, Cabalero 2001, Zohdi 2001, Erfanzadeh 2001 and Ahmadi 2004).
Investigation of forage quality some range species in different phonological stages using two methods: Chemical analysis and NIR.
Phenological Effects on Forage Quality of Five Grass Species.