عنوان مقاله [English]
Determination of preference value of plant species which grazed by crossbred cows in the Tezkhrab rangelands by timing method desirability of forage plants for livestock and wild animals is an important factor in evaluating the appropriateness of pasture with livestock. This desirability in determination of range condition, range capacity of the pasture 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 hybrid cow was determined. Method was this form That within 4 years and 6 months (May, June, July, August, September and October) and two times in one day each month and each time about 20 minutes from of grazing cattle was shot (Total 6 times) 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. In addition, interaction between species - month on the time grazing and percent of time grazed was significant. Also results showed Percent of the time grazing no significant differences between species in different years, but time grazing and percent of time grazed in different months at 0.05 levels was significant.