Determination of Preference value of Rangeland Species of Polour by Shal race sheep using timing method

Determination of preference value of plant species which grazed is an important factor in evaluating the appropriateness of rangeland with livestock. Desirability of forage plants for livestock and wild animals is This desirability in determination of range condition, range capacity and scientific management of rangelands is used. Thus attention to the preference value of plant species in a region is a key factor which can guarantee the success of management in achieving its goals. Therefore the preference value of plant species by timing method for sheep was determined in Polour in Mazandaran province. Method was this form That within 4 years and 3 months (July, August and September) and two times in one day each month and each time about 20 minutes from of grazing cattle was shot and then transfer film to Computer , Grazing time of plant species was determined. The results showed in 1% level There is significant differences Between different species in terms of duration and Percent of the time grazed. Also results showed average grouping Percent of the time grazing which threr are 4 groups . thr highest of present of the time grazing related to Elymus hispidus var hispidus and lowest of present of the time grazing related to Asperula odorata.