Tabatabaei,S M M , , Najaf-nejad,B , , Zamani,P , , Taghizadeh,A , , Ahmadi,A , and Aliarabi,H . "Estimating Chemical Composition, Degradation Parameters and Gas Production of Persian Clover Nutrients at Different Plant's Growth Stages", Iranian Journal of animal Science, 42, 3, 2011, 255-264.