A definition of animal unit from United States Department of Agriculture (USDA), appears in the Commodity Credit Corporation Regulations for the Environmental Quality Incentives Program (EQIP), at 7 CFR § 1466.3:
Animal unit means 1,000 pounds of live weight of any given livestock species or any combination of livestock species.
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Appendix E: Animal Units ."
Air Emissions from Animal Feeding Operations: Current Knowledge, Future Needs . Washington, DC: The National Academies Press,
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As of 2013, the National Science Education Standards have been replaced by the Next Generation Science Standards (NGSS), available as a print book, free PDF download, and online with our OpenBook platform.
The NGSS offer a detailed description of the key scientific ideas and practices that all students should learn by the time they graduate from high school. The standards are based largely on the 2011 National Research Council report A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas.