H.R. 4512 would prohibit the use of federal funds for animal research involving drugs, hormones, surgery, or other interventions intended to alter an animal's body to not match its biological sex. The bill defines "covered research" broadly to include any studies that disrupt development, inhibit natural bodily functions, or modify physical appearance of animals for this purpose, and applies to most vertebrate species (mammals, birds, fish, reptiles, and amphibians) except those that naturally change sex or have both male and female reproductive organs. The legislation would affect federally funded research institutions, universities, and government agencies that conduct or support such studies. The bill contains no specified funding amount or implementation timeline, as it operates as a prohibition rather than an appropriation measure. Introduced in July 2025 by Representatives Mace, Gosar, Gill, and Boebert, the bill was referred to the House Committee on Science, Space, and Technology.
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