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Symposium: Re-Evaluation of Nutrient Allowances for High-Producing Cows

Discussion

Department of Animal Sciences, University of Maine, Orono

ABSTRACT

As discussant for this symposium today I would like to first extend our thanks to Reid, Flatt and Brown for the excellent papers that they have presented. It is my job to attempt to bring their comments together, and I have decided that perhaps the best way to do this is to group the thoughts presented here this afternoon so that they will be directly related to a series of assumptions that we all make each time we balance a ration for a lactating dairy cow. We are all quite familiar with these assumptions, but it seems appropriate to review them. The first assumption that we make is that the Standard tables of feeding values for the various feedstuffs used in rationing dairy cattle list protein and energy values that are constant irrespective of the level of feed intake. The second assumption is that the utilization of metabolizable energy for lactation is constant, at the tissue level, and is not affected by ration composition.