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Estimating carrying capacity in ADA - PowerPoint PPT Presentation

Estimating carrying capacity in ADA. 10 yards. Pace off an area of pasture that one animal would need for grazing for one day as the sole source of forage. 10 yards. Calculate stock days per acre. Multiply the length X the width Calculate square yards per acre needed per animal per day

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10 yards

Pace off an area of pasture that one animal would need for grazing for one day as the sole source of forage

10 yards

• Multiply the length X the width

• Calculate square yards per acre needed per animal per day

• Divide 4840 square yards per acre by square yards needed per animal per day

• This gives Stock Days per Acre (SDA)

• Multiply SDA by the number of acres in the pasture

• The total represents the total number of stocking days in the pasture

www.farmphoto.com

• Divide stock days by the number of horses (or other livestock)

• This tells you how many days you can graze the pasture with that number of animals

NRCS, Bozeman, MT

Let’s try an example

• You have five acres of pasture and four horses

• Your experimental time period is one day, 24 hours

• Area width and length are both 25 yards

• Calculate the area by multiplying length x width:

25 yards x 25 yards = 625 square yards

• Divide 4840 square yards per acre by 625 square yards per animal day

4840 square yards/625 square yards =

7.7 stock days per acre (SDA)

• Multiply the stock days per acre times the total number of acres in the pasture

7.7 SDA x 5 acres = 38 stock days

• Divide the number of stock days by the number of horses

38 SD / 4 horses = 9.6 days

You can graze the five-acre pasture with four horses for 9.6 days

25 yards pasture

Let’s try another example grazing 6 hours a day instead of 24

• You have five acres of pasture and four horses

• Your experimental time period is 6 hours per day or 25% of a day

• Area width and length are both 25 yards

• Calculate the area by multiplying length x width:

25 yards x 25 yards = 625 square yards

• Divide 4840 square yards per acre by 625 square yards per grazing period (6 hours)

4840 square yards/625 square yards =

7.7 stock days per acre (SDA)

7.7 stock days x 24 hours = 185 hours divided by 6 hours per day = 31 days of grazing

• Multiply the stock days per acre times the total number of acres in the pasture

7.7 x 24 hours SDA x 5 acres = 924 hours divided by 6 hours/day = 154 stock days or 5 months of grazing