1. Wafers, pellets, and crumbles– Definitions and methods for determining density, durability, and moisture content. ASAE Standard S269.3;American Society of Agricultural Engineers (ASAE),1987
2. Method of determining and expressing fineness of feed materials by sieving. ASAE Standard S319.4;American Society of Agricultural Engineers (ASAE),2008
3. Official methods of analysis;AOAC,2006
4. Physical properties of feed ingredients;Appel,1994
5. Relationship of various physical and chemical characters to digestible energy in wheat and barley cultivars;Bhatty;Can. J. Anim. Sci.,1974