predlog

Animal units (AU) are used in the permitting, registration, and the environmental review process because they allow equal standards for all animals based on size and manure production. An AU is calculated by multiplying the number of animals by an animal unit factor for the specific type of animal. When more than one type of animal is planned for a feedlot, the number of AUs is the sum of the AUs for each type of animal.
https://www.mda.state.mn.us/animals/feedlots/feedlot-dmt/fee...
The concept of an animal unit (AU) has traditionally been used in North America to facilitate planning, analysis and administration of forage use by grazing livestock, but the term has also had other applications (in relation to odor control regulation, feedlot size, manure management, etc.). The term has been variously defined by regulation in different jurisdictions (…)Most (but not all) definitions are based on the concept that a 1000-pound (454 kg) cow, with or without an unweaned calf, is one animal unit, with such a cow being assumed to consume 26 pounds (about 12 kg) of forage dry matter per day.
http://en.wikipedia.org/wiki/Animal_unit

http://www.co.weld.co.us/assets/DB4063A2b92B5Aca3252.pdf