Every wholesale beef and pork price on this site, and in every USDA market report behind it, exists because of one law: the Livestock Mandatory Reporting Act of 1999, implemented in 2001. It requires large meatpackers to report to USDA the prices, volumes, and terms of their livestock purchases and their wholesale meat sales, on a fixed schedule, under penalty of law. USDA's Agricultural Marketing Service aggregates those confidential submissions and publishes them as the market reports the industry runs on.
Why Congress forced the issue
Through the 1990s, price discovery in cattle and hogs was thinning out. Packers consolidated, more animals moved on formulas and contracts priced off someone else's negotiated trade, and the voluntary price reporting of the era captured a shrinking, self-selected slice of the market. Producers argued they were selling into a market whose real prices they could not see. Mandatory reporting was the answer: if the negotiated market was going to be thin, at least every large packer's trades would be in the public record, priced and weighted honestly.
The law sets size thresholds so the burden lands on the firms that move the market; the major packers that dominate fed cattle and hog slaughter all report. Reporting runs on a clock, with major reports multiple times daily, and the requirement extends beyond livestock purchases to the wholesale side: the boxed beef prints and the daily pork report exist in their modern form because meat sales became reportable too. The law lapses without periodic reauthorization, which is why it resurfaces in farm-bill politics every few years, and coverage has expanded over the amendments rather than shrunk.
What it means for reading the data
Three practical consequences. The first is coverage: LMR data is not a survey or a sample; within its thresholds it is close to a census of what large packers actually paid and charged, which is why the cutout can be trusted as a benchmark.
The third is the boundary: mandatory reporting covers cattle, hogs, sheep, and the wholesale beef and pork trade built on them. Chicken is the big absence; broiler prices are reported through voluntary programs, which is why chicken data runs weekly and coarser than the daily beef and pork machinery, a difference visible across this site's poultry pages.
The reports this system produces are the raw material here: the boxed beef report, the daily pork report, the cattle and hog purchase reports, all of them downstream of the same statute. Meat Read's job is the layer on top: same public data, read daily, with the history, seasonals, and cross-checks already computed.