THE HAY BARN GLOSSARY
Acid detergent fiber (ADF)
- The residue remaining after boiling a forage sample in acid detergent solution. ADF contains cellulose, lignin and silica, but not hemicellulose. Often used to calculate digestibility, TDN and /or NEI. Contrast with crude fiber and neutral detergent fiber.
- Forage grown following a harvest.
- A perennial flowering plant of the legume family cultivated as an important forage crop. Scientific name: Medicago sativa. Also known as Lucerne, Purple Medic, and Trefoil.
- The integration of soil and plant sciences in growing crops and pastures
Animal unit (AU)
- Considered to be one mature cow (1000 lb, 455kg) either dry or with a calf up to 6 months of age, with an average daily forage consumption of 15 kg of dry matter. Livestock which consume more or less forage than the standard animal unit, because of kind, class, or size are rated on an animal unit equivalent (e.g. 1300 lb cow = 1.3 AU; 1 sheep = 0.1 AU)
Animal unit day
- The amount of dry forage consumed by one animal unit per 24-hour period. Animal unit day is used to express the quantity of forage intake for a period of time and may be extrapolated to other time periods, such as week, month, or year.
Animal unit month (AUM)
- The amount of dry forage required by one animal unit for one month based on a forage allowance of 26 pounds per day. The term AUM is commonly used in three ways: (a) stocking rate, as in "X acres per AUM" (b) Forage allocations, as in "X AUMs in allotment A" (c) Utilization, as in "X AUMs taken from Unit B".
- A plant that completes its life cycle and dies in 1 year or less.
- Suitable for cultivation; tillable.
- That portion of the forage production that is accessible for use by a specified kind or class of grazing animal.
The Hay Barn Glossary