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Definition of Animal Units Updated
02/28/2008
From the National Range and
Pasture Handbook (NRPH)
Animal Unit - An animal unit (AU) is one mature cow of approximately 1000 pounds
and a calf up to weaning, usually 6 months of age, or their equivalent.
| Table C-1 |
Tons of Manure
as excreted
per USDA AU |
Number of
animals per
USDA AU |
| Fattened Cattle |
10.59 |
1.14 |
| Milk Cows |
15.24 |
0.74 |
| Breeding Hogs |
6.11 |
2.67 |
| Hogs for Slaughter |
14.69 |
9.09 |
| Chicken Layers |
11.45 |
250.00 |
| Chicken Broilers |
14.97 |
455.00 |
| Pullets |
8.32 |
250.00 |
| Turkeys for Breeding |
9.12 |
50.00 |
| Turkeys for Slaughter |
8.18 |
67.00 |
From the
Costs Associated with Development and Implementation of Comprehensive Nutrient
Management Plans
From the National Engineering
Handbook (NEH) Part 651 - Agricultural Waste Management Field Handbook, Chapter
10
Factors to consider in the
design of storage facilities for solids include type, number and size of
animals, number of days storage desired, and the amount of bedding that will be
added to the manure. Equation 10–1 can be used to calculate the manure storage
volume:
where:
-
VMD = volume of manure
production for animal type for storage period, ft3
-
AU = number of 1,000 pound
animal units by animal type
-
DVM = daily volume of manure
production for animal type, ft3/AU/day
-
D = Number of days in storage
period
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