Prior to ADAA, only two categories of animal feed drugs existed, over-the-counter (OTC) or prescription (Rx) — all animal drugs approved for use were OTC. VFD products, however, sit in the middle between OTC and Rx animal drugs.
Even though a description of the NASS crop production forecast methodology is widely available, there always seems to be some misconceptions about how NASS makes corn and soybean yield forecasts. A brief overview of that methodology is repeated here. While this summary does not do full justice to the very comprehensive forecasting methodology, it is presented to assist in placing the upcoming yield forecasts in the proper perspective.