Formulas for determining total net energy in multiphase feeding regimes

Retrospective analysis of studies carried out at he University of Tennessee between 1967 and 1971 were employed in the development of formulas for determining the projected total net energy for maintenance and gain in multiphase treatment regimes. Methods were applied to these formulas in order to yield a practical application whereby the total projected consumption of any beef animal could be obtained. The data from three studies was subjected to the formulas for net energy for maintenance and gain which yielded the net energy required on any day. Mathematical procedures were applied which yielded equations for calculation of total net energy in two phase treatment regimes over the total treatment time in a discontinuous fashion. These equations, which must be worked the number of times as there were days in a phase for both maintenance and gain, were replaced with one equation each for net energy for maintenance and net energy for gain in each phase through the use of integration procedures. The net energy required, as calculated by this method, was then divided by the net energy for maintenance and gain provided by the multi-component ration, as calculated by using weighted percent or associative formulas. The result of this manipulation was a calculated, projected figure for total consumption. Replacing the variables in the formulas derived by integration with the data from the past studies yielded a projected total consumption which could be compared with the original, observed consumption. Statistical analysis of the projected consumption versus the observed consumption in these three studies indicate that this method has a high potential for calculating the amount of feed necessary for projected single or multiphase feeding programs.