Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 243 - Animal Feeding Operations › Subchapter I - General › Section NR 243.05 - Calculating animal units

Current through June 24, 2024
(1) GENERAL. The
				  total number of animal units at an operation shall be calculated using the
				  methods in both subs. (2) and (3). The department shall compare the totals
				  under both of these methods and shall use the highest calculated total to
				  determine the size of an animal feeding operation. An owner or operator of an
				  animal feeding operation shall use form 3400-25A for calculating the number of
				  animal units present at the operation.
Note: In accordance with the definition in s.
					 NR
					 243.03(4), animals included in the
					 total count may be housed at more than one site or location.
Note: Form 3400-25A can be obtained at regional offices of
					 the department or the department's Bureau of Watershed Management, 101 S.
					 Webster St., P.O. Box 7921, Madison, Wisconsin 53707.
(2) COMBINED ANIMAL UNITS. The number of
				  animal units present at an operation shall be calculated by multiplying the
				  number of animals for each animal type by the appropriate equivalency factor in
				  Table 2A. The total number of animal units at the operation is the sum of the
				  calculated animal unit numbers of all animal types present at the operation.
Note: Under the combined animal unit calculation, an
					 operation with 400 animal units of milking cows, 300 animal units of heifers
					 and 200 animal units of swine would have a total of 1000 animal units
					 present.
(3) INDIVIDUAL
				  ANIMAL UNITS. The number of animal units present at an operation shall be
				  calculated by multiplying the number of animals for each animal type by the
				  appropriate equivalency factor in Table 2B. The total number of animal units at
				  an operation is the highest calculated number of animal units for any
				  individual animal type.
Note: Under the individual animal unit calculation, an
					 operation with 400 animal units of milking cows, 300 animal units of heifers
					 and 200 animal units of swine would have 400 animal units present.
(4) OTHER ANIMAL TYPES. For animal
				  types not listed in Table 2A, the department shall base equivalency to animal
				  units on live animal weights, the characteristics of the manure, including
				  nutrient content or pollutant concentration, or a combination of both. In cases
				  based strictly on live weight, 1,000 pounds of live weight is equivalent to one
				  animal unit.
TABLE 2A
Combined Animal Unit Calculation
								  Equivalencies
Animal Type
Combined Animal Equivalent of 1,000 Animal
								  Units
Combined Animal Unit Equivalency
								  Factor
Dairy Cattle:
Milking and Dry Cows
715
1.4
Heifers (800 to 1200 lbs)
910
1.1
Heifers (400 to 800 lbs)
1670
0.6
Calves (under 400 lbs)
5000
0.2
Veal Calves:
Per Animal
2000
0.5
Beef Cattle:
Steers or Cows (400 lbs to Mkt)
1000
1.0
Calves (under 400 lbs)
5000
0.2
Bulls
700
1.4
Swine:
Pigs (55 lbs to Mkt)
2500
0.4
Pigs (up to 55 lbs)
10000
0.1
Sows
2500
0.4
Boars
2000
0.5
Sheep:
Per Animal
10000
0.1
Horses:
Per Animal
500
2.0
Ducks:
Per Bird (Liquid poultry manure handling)
5000
0.2
Per Bird (Non-liquid poultry manure
								  handling)
100000
0.01
Chickens:
Per Bird (Liquid poultry manure handling)
3000
0.033
Layers (Non-liquid poultry manure
								  handling)
10000
0.01
Broilers and Pullets (Non-liquid poultry manure
								  handling)
200000
0.005
Turkeys:
Per Bird
55000
0.018
TABLE 2B
Individual Animal Unit Calculation
								  Equivalencies
Animal Type
Individual Animal Equivalent of 1,000
								  Animal Units
Individual Animal Unit Equivalency
								  Factor
Dairy Cattle:
Milking and Dry Cows
700
1.43
Heifers (400 to 1200 lbs)
1000
1.0
Veal Calves:
Per Animal
1000
1.0
Beef Cattle:
Steers, Bulls or Cows (400 lbs to Mkt)
1000
1.0
Swine:
Pigs (55 lbs to Mkt)
2500
0.4
Pigs (up to 55 lbs)
10000
0.1
Sheep:
Per Animal
10000
0.1
Horses:
Per Animal
500
2.0
Ducks:
Per Bird (Liquid poultry manure handling)
5000
0.2
Per Bird (Non-liquid poultry manure
								  handling)
30000
0.0333
Chickens:
Per Bird (Liquid poultry manure handling)
30000
0.0333
Layers (Non-liquid poultry manure
								  handling)
82000
0.0123
Broilers and Pullets (Non-liquid poultry manure
								  handling)
125000
0.008
Turkeys:
Per Bird
55000
0.018