HUUSKONEN, A., KHALILI, H. and JOKI-TOKOLA, E. 2008. Need for protein supplementation in the diet of growing dairy bulls fed total mixed ration based on moderate digestible grass silage and barley. Agricultural and Food Science. 17, 2 (Jan. 2008), 109–120. DOI:https://doi.org/10.2137/145960608785328215.