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Animal Unit Months

Here’s more math for figuring out how to feed our livestock while making a good living on leased pasture. Even if math isn’t your strong suit, we take it one step at a time so that it’s as easy as it can be.

AUM Breakdown

Animal Unit Months

Figuring pasture use rates by Animal Unit (AUM) is more common in the western United States where it is the basis for public lands leased to ranchers for their stock. The nice thing about this method is that it makes it easy to plug numbers into a formula to give you a good idea of how many animals you can feed for how long. The formula factors in pasture quality, and the market price of hay so that you can come up with something fair to both parties.

An Animal Unit Month (AUM) is the amount of forage required to sustain a 1,000 pound cow with her calf at her side for 30 days. That works out to about 26.1 pounds per day. Forage requirements for all the other classes of livestock are shown in relationship to that 1,000 pound cow and her calf.

Here’s the formula:

Number of Animal Units x Average Hay Price Out of the Field Per Ton x Pasture Quality Factor = Rate Per Head Per Month

Pasture Quality Factor(Note: This formula works well for irrigated pasture, but may over-estimate non-irrigated, arid range rental rates where there is less forage and very little infrastructure.)

Here’s an example of what the formula looks like using a 1200-pound cow with her calf, during a time when hay is going for $10o per ton, and you’re hoping to rent an excellent grass and legume pasture:

1.20 AU x $100/ton x .20 Quality Factor = $24/AUM

From here the landowner and prospective lease can negotiate price based on expectations for management of the pasture, past experience, water and fence infrastructure and other requirements.

Don’t like that formula?  Here’s another option:

Hay Value Per Ton / 8.5 Rule of Thumb Forage Equivalent x Animal Unit = Rate Per Animal Unit Per Month

Using the same cow-calf pair and hay price, here’s that formula in action:

($100 per ton/8.5) x 1.2 = $14.12 per AUM

This is also just a starting point and depending on the result may point out whether you’ve over- or under-estimated the value of your hay.

Sharing Profit and Risk

If you intend to graze Stocker Cattle, establishing a rental rate based on pounds gained means that the landowner and the lease share the profit if there is one, and the risk if gain isn’t as great as expected. If you’re considering this method, you’ll have to have base values for the cost of gain, the expected gain, how long the animals will graze, and the per animal costs for caring for them through the grazing season.

All of the formulas I found for this method start with a Pasture Charge per Head per Month, also called a Seasonal Cost.  None of them told me where they got that number, but they all started with $10.  So starting with that as my full disclosure, we’ll go through this figuring process.

Pasture Charge Per Head Per Month x Number of Months = Seasonal Cost

$10 x 6 months = $60 per head

We use this as our base and then we divide by the pounds of gain we expect. This will change depending on the kinds of animals you’re running, grazing management, health and parasite load of the livestock and forage quality. This is where the risk sharing comes in. Let’s say that we think our stock will gain 200 pounds each while they’re on pasture.  Now our formula looks like this:

($10 x 6) / 200 pounds = 30¢ per pound of gain.

Thirty cents per pound is our break-even price and if the animals all gain 200 pounds each, that’s what the landowner gets. If the stock gain more, say 240 pounds, here’s what the landowner gets per animal:

240 x .30 = $72 per head

But if the animals only gain 175 lbs each, the landowner gets less money per animal:

175 x .30 = $52.5 per head


Principles of Professional Ranch Caretakers

Lease us your ranch – We will take care of it.
Financially, Economically, Physically, and Emotionally.
We will keep the grass growing and the water flowing.
We will keep the fences tight and the improvements in great condition.

Where do you see your ranching enterprise in 1 year, 5 years, 10 years 100 years. The actions you take today will basically – dictate to what your ranch will be in the future.

  • More Brains put together to find more Ideas to create more Solutions.

By Utilizing the cumulative Brains around you – You will have the resources to create a reality of where your operations is at and where you would like it to be.

Working hand in hand with our resources – we will create a vision and work to fulfill it through a focused effort. Your land will become a healthy vibrant ecosystem capable of sustaining wildlife and livestock beyond expectations.

You are an Investor – The land that you own will appreciate as it is – 1% to 3% per year. There will be sum bumps along the way, but your investment will continue to grow Even if you do absolutely Nothing with it.

  • What if you make a commitment to make it better – Increase the grasses and the waters. What if your Land can be developed to KEEP more of the moisture in it and have less run off.

Partnerships – We offer to run your ranch land in this manor. Through Planned Timed Management Grazing and strategic placement of Water and Fences – Your Investment will have the opportunity to grow beyond your expectations.

Long Term Focused Commitment – is the Key to your operation being successful. We will enter into an agreement to LEASE your ranch and run it as if it were our own – To Grow and develop it to achieve optimal production by utilizing the Sunlight and Water along with professional stockmanship. This will develop more Grass which results in more Water staying on the place resulting in healthier soils and productive plants.

A Board of the best and brightest will be asked to make recommendations and be a part of developing the overall plan for the Land. Grass specialists and Master Stockmen will have a say as to how to operate the enterprise.

You have done a great job of getting your operation to this point in time. This will not be forgotten. Change happens and we understand. We will work together to develop a plan that will take your operation to the next stage.

Give us a call – 307.331.0357

It would be an honor to meet you and sit down to discuss what we together can do for your ranching operation.

Warmest Regards


Kit West – CEO Western Livestock & Grass

UNL Cow-Q-Lator

An Excel worksheet with Examples comparing the cost of TDN and Crude Protein in different feeds considering transportation and handling costs with losses. It also calculates the feed needed and total cost given herd size and days fed.

This is the Goto software that will give you the Best idea on using your available resources to combine them – Making sure your Livestock are getting the right balance in their DIET – while keeping your costs Low.

Click Here for Link to Cow-Q-Latro

Square Spinner Hay Feeding Machine

If YOU Must feed Hay – Then do it with the Spinner.

Square Spinner was designed to be both effective and efficient.

The Square Spinner stands uniquely alone as there is nothing else on the market, that attaches easily to a 3 point hitch, to feed square bales. It eliminates pulling a processor over varying terrain and through deep snow. Rather than chewing feed up, which can lead to loss in wind and snow, it flakes the hay off without shredding. It enables the feeding of square bales to be a one person job and is very easy to use. The design is simple and the cost is very reasonable as compared to other processors.
Features and Benefits:
• One person feeding operation
• Adustable to feeed all large square bales.
• Easy bale handling
• Capable of pulling wagon/sled with the Square Spinner in the up position.
• Adjustable to fit any tractor
• Low maintenance, grease bearings accordingly
• Feeds product flake by flake, as light or heavy as desired

Impletment Requirements:
• No PTO, all hydraulically driven
• 2500 psi hydraulic hookup required
• Suggested 65 horse power tractor m1n1mum

Grass Hay • Alfalfa
Sorghum • Sudan
Corn Stalks •
Will feed anything that can be put into a bale