Milling yield shall be determined by the use of an approved device in accordance with procedures prescribed in FGIS instructions. For the purpose of this paragraph, "approved device" shall include the McGill Miller No. 3 and any other equipment that is approved by the Administrator as giving equivalent results.
7 C.F.R. §868.206
Milling yield shall not be determined when the moisture content of the rough rice exceeds 18.0 percent.