The following language has been included in most recent USDA appropriations acts. (Do a search in Thomas.loc.gov.) It's a gag order imposed by the appropriations sub-committee. It's also a test of whether the Republicans will adhere to their call for open government. Note the language prohibits telling the President or OMB of information provided to appropriations.
Sec 710 of 2010 Ag Appropriations Act
Sec. 710. None of the funds appropriated or otherwise made available to the Department of Agriculture or the Food and Drug Administration shall be used to transmit or otherwise make available to any non-Department of Agriculture or non-Department of Health and Human Services employee questions or responses to questions that are a result of information requested for the appropriations hearing process.