I grazing n
pasture
(Continued from Pag* E 37)
mine stocking rate and carrying
capacity, the concept of animal
units is often used this gives a
much better measure of pasture
required, as compared to using
animal numbers. One animal unit
is based on the daily forage intake
of one 1,000-pound dry cow
(about 25 pounds qf dry forage per
day). Table 1 gives some typical
animal unit values for various spe
cies and classes of livestock.
Estimating the amount of acres
required to pasture a herd or flock
depends not only on the feed
requirements of the animals but
also on the available forage pro
duced. Pasture growth is depen
dent upon plant species, soil char
acteristics, topography, fertiliza
tion, temperature, and soil
25 cows x 1.3 AU per cow =
+ 15 heifers x 1.0 AU per heifer =
Total AU for herd
grazing low producing Kentucky
bluegrass and white clover pasture
in May, then approximately 57
acres will be needed to support the
herd.
4.75 AU x 1.2 acres per AU = 57 acres
Second estimate how many
acres the herd will need during
each month of the grazing season
using Table 2. If the herd will be
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moisture. Because of the variabili
ty in pasture growth, we can only
estimate the amount of pasture
required for' grazing animals.
Table 2 provides some estimated
values of die acres required for
grazing animals for various types
of pasture.
To estimate how much pasture
a herd or flock will need, first cal
culate the total animal units of the
herd using Table 1. For example,
if a beef herd contained 25 dry
cows weighing 1,300 pound each
and IS heifers at 550 pound each,
then there are 47.5 animal units
(AIH in this herd. .. .
The same had giazing high
producing Kentucky bluegrass
and white clover pasture would
only need approximately 19 acres
during May.
Sehnupp'i Grain
Roasting, Inc.
RD t Labanon, PA
1-800-452-4004
717-808-6811
PMh.ro .n~io. P S!U re Ar l2hL al Ao ?M ßqui f? d ,0 provide ,ora 0« needs for one animal unit*
Pasture species prod. yield April May June July Aug Sept Ofct
Ky bluegrass w. clover
low
medium
high
low
medium
high
Red clover/grau low
medium
high
Bdeft trefoil/grau low
medium
high
Tall grass plus low
nitrogen medium
high
low
medium
high
low
AlfaKa/grass
Warm-season
grass
Stockpiled tall
fescue
medium
high
Spring seeded low
brassicas medium
high
Summer seeded low
brassicas medium
high
Com stover
32.5 AU
15.0 AU
47.5 AU
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•Based on an animal unit consuming 25 lb of dry matter forage per day with 70% of pasture utilized.
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