Preference value of plant species grazed by sheep during the grazing season in Khoshkerood Saveh rangelands)Case study: cross-breed Sangsari-Afshar)
Abstract:
Determination of preference value of plant species by grazing livestocks is one the most necessary information for the planning and management of rangelands. The purpose of this study was to investigate the preference value of plant species grazed by sheep during the grazing period in Khoshkeh rood Saveh Rangeland of Markazi Province using species selection index.
Production and consumption data of species in and out of the enclosure were collected over six months of grazing season for three years to calculate the species selection index. Maximum preference values for Poa sinaica (in whole grazing season) and Salsola laricina (especially November and December) and minimum preference values for Cousinia cylindracea (in whole grazing season and especially in dry years) was recorded. Reduction in rainfall in 2008 increased the percentage of utilization and preference index of species. As In April 2008, Artemisia sieberi with preference index 2 was as a relatively palatable species and Noaea mucronata and Stachys inflata with preference indexover 2.1 were considered quite palatable species .Salsola laricina in November and December in all the years with preference index over 1.4 is was considered as relatively palatable species.
Salsola laricina is a critical resource for livestock of steppe rangelands throughout the year, especially from mid-November to mid-March. So that in this time, this species has high palatability than other species accompanied and with proper grazing management should be prevented from excessive utilization.
Language:
Persian
Published:
Journal of Range and Watershed Management, Volume:70 Issue: 2, 2017
Pages:
359 to 372
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