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In this episode, we dive into pasture management best practices with insights from Abram Bowerman. Learn how to observe pasture conditions, manage forage growth, and make strategic decisions on grazing rotation. We also explore techniques for maintaining diverse plant species, measuring forage inventory, and mitigating the effects of fertilizers on livestock and pasture health
Pasture Management, Best Practices
By Abram Bowerman
SPICKARD, Missouri:
“Why don’t we value and utilize our pasture more than we do?”
The first step is to acknowledge the potential. The second step is to learn how to manage your forage to develop and maintain quality forages. And the third step is to actively manage your forages. Respect, understanding, performance.
Those three words would transform many marginal crop fields back to pasture! May that day come quickly. There are plenty of good books on pasture management for further consideration, however forage is and has been the foundation of my sheep business. So, let’s pretend we are going on a pasture walk, taking time for observation.
What species are the sheep eating?
How much plant residual is left?
Do you see any bare soil?
What about manure quality?
Are the sheep grazing or ruminating?
The best way to determine the maturity level of your grass is by counting the leaves. Once a grass
stem has two leaves the plant is entering a peak growth phase. Peak growth will continue through the development of leaf number four and then begin to slow with number five. By the time leaf number six is formed, leaf number one is dying.
Livestock usually make the greatest gains when forage is harvested in its peak growth phase.
This pretty well holds true whether the grass is actively growing or its growth is suspended in dormancy or curing.
Here is a good rule of thumb.
You can begin grazing when your grass stems have developed more than two leaves, provided two leaves or the equivalent are left intact. Regrowth will not be slowed significantly.
Said another way, if the grass has three leaves, graze one. If it has four leaves, graze two.
Reducing the plant solar collector to less than two leaves may temporarily reduce plant growth by as much as 80%.
A paddock should not be regrazed until all the blades of grass have a sharp point. If the flock is returning from the grazing circuit to paddocks that contain grass leaf tips that appear mowed off the rest period is too short. You may want to consider reducing animal numbers or increasing the acres in your grazing pool.
Maturity of legumes is best determined by bloom stage. Alfalfa is ideal when 10% of the plants are
blooming. I like to graze red clover after it has reached full bloom and 10% of the blooms have turned brown, which results in a fresh seeding of clover every time a paddock is grazed.
Forbs vary tremendously in their need for a recovery period. Many of them cycle in and out of a palatable state. If the flock is not eating a certain plant just wait. It may well make it onto the menu when it becomes more mature.
Grazing pastures composed of a variety of forages will result in some species being under ripe, some perfect and some plants will be over ripe. Just do the best you can to favor the species you desire.
Leaf counts/maturity correlations are pretty uniform across most species of grass. On the other hand plant height at the point of maturity will vary with fertility, moisture, species and other conditions.
It is NOT the height of the grass plant that determines when the sward is ready to graze, but the maturity level of the sward. When grass is fully recovered and quite mature it should be grazed, even if it is only three inches tall. Grazing stimulates regrowth and optimizes soil regeneration. A plant that has been grazed will pump much more carbon into the soil than a plant that has matured and is dormant.
Forcing livestock to graze undesirable plants will lead to over-grazing of desirable plants. In that scenario your management would favor the species you don’t want. Mowing or bushhogging would be a better way to reduce competition from unwanted herbage.
A pasture’s composition will change somewhat seasonally. The pasture sward should be eaten, mowed or trampled to the ground once a year to allow all species an equal opportunity to grow. Otherwise continual selective grazing will result in species loss.
Likewise a full recovery at least once each year will allow maximum root development and seed production.
As a grazer you can control the species mixture of your pasture to a large extent by keeping your grazing management flexible and adaptive. The species composition can be shifted in a major way in two to three years. The outcome may be negative or positive, depending on your management.
Management practices need to be adapted to favor positive outcomes from each pasture, seasonand year. The context is always changing so staying adaptive and flexible to favor what you want is necessary. Be slow to kill something that wants to live and don’t try to keep something alive that wants to die!
Non-selective grazing is best viewed as a bite taken out of everything, not everything grazed to one even height. Trying to graze everything down to one even height will end approximately at ground level.
However, leveling rank stands of grass will promote forage diversity because forbs and legumes will have an equal chance to grow in the weakened grass stand.
A common mistake cattlemen often make is to get sheep or goats to control weeds and brush.
Grazing management is tailored to kill the weeds. Once killed your sheep just lost their food source.
You don’t keep cows to kill grass. We only expect cows to prune the grass, raise calves and prune more grass. The view of weeds should be adopted by shepherds. Utilize the weeds, raise lambs and graze more weeds.
In grazing circles the term trigger height suggests that when the overall sward has been grazed down to a certain height a paddock shift is triggered. I suggest that shepherds should add trigger species to their monitor.
The trigger species are the first three to five plant species that the majority of the flock eat right after they are moved into a new paddock. When those three to five plant species are grazed out a paddock shift should be triggered, provided you wish to optimize sheep performance.
Keep tabs on your forage inventory. The simplest math is to divide the acre units grazed by the flock each day into the total number of acres at your disposal. This calculation gives you the number of days the flock may continue to graze.
If the flock is grazing 50% of the biomass and the forage doesn’t grow any more after that day you can probably make a second round on the pasture taking another 50% of the remaining residual. So if your first round lasts 70 days, then the round following should last 35 days, unless of course if the forage continues to grow. Being able to measure your forage bank out in front of you is peace of mind, just like knowing how many bales of hay are in the barn.
Another method used to measure forage inventory is to physically measure your forage depth on an acre by acre basis. A healthy diverse stand of forage may produce 250 to 300 pounds of dry matter per acre inch of standing feed. So, if you have eight inches of dense forage it should yield 2000 pounds of dry matter per acre. Let’s leave 500 pounds per acre as soil cover for an earthworm party. That leaves us with 1500 pounds of dry matter per acre. Sheep will eat approximately the equivalent of 4% of their body weight in dry matter daily.
So if your ewes weigh 125 pounds each thus needing five pounds of dry matter daily, then your 1500 pounds of useable forage per acre will generate approximately 300 sheep days per acre.
Limiting access to stockpiled forage will stretch your resources and sustain performance further into the dormant season. Managed grazing has been referred to as controlled starvation. While rationing forage to dry ewes makes economic sense no sheep should be reduced to a starvation plan.
Moral: ration but don’t starve.
Is fertilizer positive or negative?
I am going to exercise my freedom of speech and state that it is usually a negative management practice. Here is why. Nitrogen fertilized grass can cause a magnesium deficiency in livestock. While this is a common disorder occurring in many flocks and herds we have never had an issue with our own livestock, simply because we have never applied fertilizer. Nitrogen fertilizer also reduces the presence of legumes in the sward. The same thing happens if excessive quantities of hay are fed on a pasture. In both cases after a few years the excess Nitrogen will dissipate or leach out of the soil and with sufficient animal impact the legumes will reappear. Fertilizer has also been proven to increase the toxicity of fescue. All in all, dependence on fertilizer has a propensity to leave your pasture operation bleeding red ink. For a variety of reasons the least of which is not the cost of this volatile input.
Thank you for taking time to walk through the pasture. One pasture walk won’t make you a professional manager, but you will never be a pro unless you take time for that first walk.
Abram Bowerman is a multi-species grazier in north central Missouri, with sheep as the centerpiece of the operation. He promotes low labor, natural solutions for challenges facing shepherds. To contact, write him at 543 north east 90th St. Spickard, Missouri 64679. His book The Practical Shepherd, is offered on at The SGF bookstore.