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Excerpts: Livestock-production units provide a basis for making estimates of the feed needed for livestock production at the national level. Two sets of livestock-production units are presented in this report. One set is constructed by weighting the aggregate production of each livestock item by the grain and concentrates needed per unit of product. The other set is constructed by weighting with the total feed needed per unit of product. The calculation of livestock-production units is similar to that in which feed needs at the national level are estimated from the number of animal units. Although not available until the end of each feeding year, it is a more accurate measure for past periods of time, because livestock production units are more closely related to trends in feed consumption than are animal units (figs. 1 and 2). Improvements in feeding efficiency, substitutions of feed for other farm resources, delayed feeding, and feeding of cattle and hogs to heavier or lighter weights are accounted for directly.

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