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Energy and protein evaluation of conventional and non-conventional feedstuffs. Possibilities and pitfalls. I Molina Alcaide, E., Ben Salem, H., Biala, K. Morand-Fehr, P. (Eds.). Sustainable grazing, Nutritional Utilization and Quality of Sheep and Goat Products. Bind Options Mediterrannes, Serie A, No. 67. 2006. s. 307-317