2011-09-052011-09-051976https://hdl.handle.net/10365/17630AS-609; in cooperation with the North Dakota State Dairy Department. Dairy plants and dairymen are continually asking questions about butterfat tests, including: Why do we see variations in butterfat tests? Why is there a difference between the DHIA average test and the plant test? What effect does feed have oil butterfat test? The following is an attempt to answer some of these questions for both dairyman and milk processor, because it is important for both parties to understand that fat tests do vary and that there is usually a reason for such variation.NDSU Agriculture and University Extenson: Creative Commons Licensing Deed (http://creativecommons.org/licenses/by-nc-sa/3.0/)Dairying.Farm management.AS-609