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The University of Arkansas, Division of Agriculture offers assistance to producers
in the areas of ag lime quality, grazing, and livestock hay calculators. Brief descriptions
are provided along with a link to download the calculators.
University of Arkansas System Division of Agriculture Ag Lime Quality Calculator
Ag lime is applied to neutralize soil acidity and raise soil pH. Lime quality is dependent
on the fineness of the material and the percent calcium carbonate of the limestone
In Arkansas, ag lime does not have to meet a minimum quality standard, but each lime
vendor is required by state law to have their ag lime product tested for sieve size
and % CCE (calcium carbonate equivalent). The fineness measure used in Arkansas is
the amount of material passing through 10, 60, and 100 mesh sieves. The University
of Arkansas ag lime recommendations are based on a lime product with a liming value
To use this calculator, lime test information is needed from the lime vendor for the percent of the lime product passing through 10, 60, and 100 mesh sieves and the percent
CCE (calcium carbonate equivalent). Cost per ton of material, including hauling, and spreading
costs, can also be included so lime products can be compared for economic value per
pound of effective liming material. Up to three lime samples can be evaluated with
Download the 2020 Ag Lime Quality Calculator
University of Arkansas System Division of Agriculture 2020 Grazing Calculator
This program includes three calculators that allow the user to makes estimates for
pasture rotations, setting stock density for mob grazing, and estimating field strip sizes for strip grazing stockpiled forage
Information on animal numbers and field or paddock size is needed. Drop down menu
boxes are provided for certain factors to standardize estimates.
Click one of the tabs on the bottom of the spreadsheet to select one of the three
calculators. Click on each cell where indicated to highlight an arrow. Click the arrow
to open a menu of choices for that option. Select the option nearest to the farm conditions
Pasture Rotation Calculator
The Pasture Rotation Calculator helps estimate the number of days a given size paddock
or pasture can be grazed by a given size herd. Calculations are for beef cattle.
However, there are some rules of thumb for other types of livestock. Horses are substituted
one for one with cows for stocking rate. Generally 4-5 sheep or goats consume about
the same amount of forage as one mature cow. And common recommendations suggest that
one sheep or goat can be added per cow when both species are grazed together.
Mob Grazing Calculator
Mob grazing is often used as a tool where high stocking rates are used to trample
down overgrown vegetation to open the canopy allowing regrowth of desirable forage.
Forage utilization can be as low as 20% for brushy, mature vegetation, but can be
higher for quality forage. When high stock densities are used, paddocks must be rotated
frequently to provide enough quality forage to sustain the grazing animals. This calculator
estimates the paddock size or herd size needed to achieve certain stock densities per acre. It also estimates the rotation frequency needed to provide adequate forage availability to sustain the grazing herd.
Strip Grazing Calculator
Strip grazing is often used for short-term grazing across a large field or when stockpiled
forage is grazed during winter. This calculator estimates the strip size of forage
needed for a given size herd. It also estimates the number of grazing days from a
pasture or paddock based on given forage availability estimates. The field size, field
width (feet), and forage height with forage density are needed.
Download the 2020 Grazing Calculator
University of Arkansas System Division of Agriculture Hay Quality Calculator
This program calculates the percent of crude protein (CP) and total digestible nutrients
(TDN) requirements met by hay for different classes of livestock. The hay sample ID
and CP and TDN levels from hay tests (dry matter basis) for up to six hay samples
can be entered and compared for beef cows, stocker calves/heifers, horses, and sheep/goats. When the hay data are entered, click on the tab corresponding to the animal being
fed. Values shown in green meet 100% or more of requirement for that animal. Values
shown in red meet 90% or less of requirement for that animal. A nutritionist should
be consulted for feeding recommendations when values do not meet CP or TDN requirements.
Download the 2020 Livestock Hay Calculator