Why is anticipating feed and residual use of corn so difficult?
The timeliness of U.S. corn consumption data varies by category of use. The USDA provides weekly data on the amount of corn inspected for export with a lag of only four days. The U.S. Energy information Administration provides weekly estimates of ethanol production (with corn as the predominant feedstock) with a lag of only five days. Data relative to the consumption of corn for other domestic processing uses is not readily available, but the rate of use is so consistent that consumption is not difficult to anticipate.
In contrast, information relative to the consumption of corn as livestock feed is not available on a timely basis since no Census or USDA survey data are collected in this category. Instead, the USDA's quarterly estimate of corn stocks provides the basis for estimating feed and residual use of corn in the quarter prior to the reference date for the stocks estimate. Feed and residual use is calculated as total use during the quarter minus the estimates of use in the other categories. The calculation of feed and residual use during the first quarter of the marketing year is used to forecast use for the rest of the marketing year and that forecast is updated with each subsequent quarterly stocks estimate. The process of anticipating the magnitude of feed and residual use to be revealed by the stocks estimate and the projection of marketing year use based on the revealed rate of use is "messy" for several reasons.
First, the residual component of feed and residual use appears to vary considerably from year to year. This is illustrated by the variation in the magnitude of feed and residual use per unit of livestock production. The USDA estimates the number of grain consuming animal units for each corn marketing year. That estimate is based on an estimate of the number of animals fed by species, weighted by the amount of grain required per animal in each species. In the previous six years, the estimate of grain consuming animal units has ranged from 91.6 million to 95.5 million and the magnitude of feed and residual use of corn per animal unit has ranged from 47.1 to 61.9 bushels. Some of the variation in feed and residual use of corn per grain consuming animal unit is explained by the variation in the magnitude of feed and residual use of other grains, particularly wheat. Still, the magnitude of feed and residual use of all grains per grain consuming animal unit has varied by 20 percent over the past six years. The USDA acknowledges this variation and attributes much of the variation to crop size, with larger residual use associated with large crops and vice versa. The large variation illustrates the difficulty of anticipating quarterly feed and residual use of corn based on estimates of the number of livestock fed during the quarter.
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