"The Agriculture appropriations bill funds the U.S. Department of Agriculture (USDA), except for the Forest Service. It also funds the Food and Drug Administration (FDA) and--in even-numbered fiscal years--the Commodity Futures Trading Commission (CFTC). Agriculture appropriations include both mandatory and discretionary spending. Discretionary amounts, though, are the primary focus during the bill's development since mandatory amounts generally are set by authorizing laws such as the farm bill. […] In Congress, the FY2016 Agriculture Appropriations bill has been reported in both chambers (H.R. 3049, S. 1800), but has not gone to the floor in either chamber. The discretionary total in the House bill is $20.650 billion; in the Senate bill it is $20.510 billion. In general, most amounts in the House and Senate bills are relatively similar. Officially, the two bills are $105 million (0.5%) apart in the discretionary total (Senate basis; excluding CFTC). But the Senate bill would spend about $180 million more than the House bill because of extra offsets in the Senate bill through extra Changes in Mandatory Program Spending (CHIMPS) beyond the House bill's level."
CRS Report for Congress, R44240