rangeland shrubs may provide mechanical facilitation on their understory plants, by protecting themagainst the livestock grazing. however, such a facilitation effect may vary depending on the rangelandutilization rate. in a field research, mechanical facilitation of rangeland shrubs was compared in ahighly grazed, a moderately grazed and an enclosure site; in an arid rangeland, kakhak, gonabad,...

in order to choose the best adaptable genotypes for arak condition, 31 genotypes of crested wheatgrass collected of gene bank research institute of forests and rangelands iran, were examined under normal and drought stress conditions using randomized complete block design with 3 replications during 2004-05. the days to heading and days to pollination, plant height (cm), number of tiller, spike ...

in order to estimate the relationship between forage quality and preference value of plant species for raini goats(capra aegagrus hircus), a field study was carried out on raini goats’ grazing behavior in some desert habitats.crude protein (as the most important factor affecting forage quality) of all plant species was measured at twophenological stages (spring and summer, 2010) in the dry rang...

red clover (trifolium pretense) has wide adaptability to different soil and climatic conditions, and suitable digestibility of forage compared to the other clover species. new red clover cultivar, nasim, was primarily selected from clover germplasm received from food and agriculture organization (fao), the united nations, in seed and plant improvement institute, karaj, iran. agronomic and yield...

information on animal daily forage needs is essential for an estimation of rangeland grazing capacity. accordingly, weight and animal unit equivalent (aue) for each individual class of animal should be determined. live weights of baloochi sheep as based on average live weights of 3 and 4 year old ewes were determined. five herds of baloochi breed sheep were selected for the task. in each herd, ...