At the link listed above, you will find:
The enabling legislation of both the producer and processor dairy promotion programs (7 U.S.C. 4501 and 7 U.S.C. 6401) requires the U.S. Department of Agriculture (USDA) to submit an annual report to the House Committee on Agriculture and the Senate Committee on Agriculture, Nutrition, and Forestry by July 1. The producer and processor programs are conducted under the Dairy Promotion and Research Order (Dairy Order) (7 CFR § 1150) and the Fluid Milk Promotion Order (Fluid Milk Order) (7 CFR § 1160), respectively.
The report which should have been on July 1, 2010 available is for 2009. Instead, if you click on the latest listed report "2009" you actually will get the report for - you may have guessed it - 2008.
Most of the report relates to economic models. The assumptions, and they can only be assumptions because there is no experimental control, cause the conclusions.