Provision of a balanced supply of fermentable metabolisable energy (FME) and effective rumen degradable protein to rumen microbes enables maximum utilisation of energy and protein in dairy cow diets. Cane molasses containing a high proportion of water soluble carbohydrates can be very effective source of FME in dairy cow diets. The objective of this experiment was to evaluate the effect of the inclusion of molasses and fishmeal in the concentrate component of the diet, on the performance of lactating dairy cows.