Forty miles north of the U.S.-Mexico border in Southern California’s Imperial Valley, the Brandt Company cattle ranch is the largest single point source of methane emissions in the state, releasing more of that greenhouse gas than any oil or gas well, refinery or landfill. The 643-acre feedlot is home to 139,000 beef cattle, according to […]
In the context of production, a by-product is the "output from a joint production process that is minor in quantity and/or net realizable value (NRV) when compared with the main products".[2]
these aren’t mutually exclusive
https://en.wikipedia.org/wiki/By-product
soy oil punches way above it’s weight in value.