1. Agricultural Research Council. 1965. The nutrient requirements of farm livestock. No. 2. Ruminants. Technical Reviews and Summaries, H.M.S., London.
2. Straw as the sole roughage in the ration of dairy cows;Amir,1971
3. Association of Official Agricultural Chemists. 1960. Official methods of analysis, 9th ed. Washington, D.C.
4. The utilization of the energy of food;Blaxter,1961
5. Table of composition of feeds for cattle and sheep. Agricultural Calendar (in Hebrew);Bondi,1960