Mob Stocking — High Density

Practical

How UHSDG operates:

• Stock density — typically 200,000+ pounds of animal weight per acre at the moment of grazing. On a [[small-farm|small farm]]: 30 cows on a 1/8-acre paddock for an hour. On a large ranch: 500 cows on a 1-acre paddock for 30 minutes.
• Move frequency — multiple paddock moves per day; in some operations every 30–60 minutes during active grazing.
• Polywire infrastructure — single or double polywire on geared reels; step-in posts; 12-volt or solar fence chargers; the operator is constantly setting up the next paddock while the herd grazes the current one.
• Trampling outcome — at this density, animals trample most of the plant material they don’t eat; the result is very rapid coverage of bare ground with biomass residue.
• Manure outcome — extremely uniform deposition; the entire paddock receives a heavy manure pulse in one short event.
• Rest interval — long, often 90–180 days; the trampled-and-manured paddock needs full recovery time.

Specific objectives:

• Soil cover establishment — rapidly building biomass residue on bare or thin-cover ground.
• Soil-organic-matter accumulation — maximum trampled-residue per area, decomposing into soil.
• Pasture diversification — reduced selective grazing means less-favored plants get equal pressure with preferred species.
• Predator-flush effect — concentrated herd activity disrupts grasshopper, tick, and other pest populations.

Scientific

The peer-reviewed research on UHSDG specifically (vs general mob-grazing) is thin; most evidence is anecdotal or case-study from working operations. Documented effects in published case studies and on-farm research:

• [[soil-organic-matter|Soil organic matter]] — measured increases in some sites, no measurable effect in others.
• Bulk density — sometimes increases (concerning), sometimes decreases (favorable); depends on soil moisture at grazing and on rest interval adequacy.
• Plant species composition — often shifts toward more diverse, with some increase in legume and forb composition.
• Animal performance — variable; UHSDG can suppress weight gain if forage is genuinely insufficient or if animals don’t have time to consume what’s needed.

The honest position: UHSDG is a powerful tool used in skilled hands for specific soil-rebuilding objectives. It is not a default grazing system; it is an episodic intervention. Operators who try to run UHSDG year-round usually fail.

Critique

UHSDG’s risks:

• Compaction risk — wet soil under heavy hoof pressure can create severe compaction; UHSDG on wet ground is a mistake.
• Animal stress — stock at extreme densities can experience social-stress and limited access to water; thoughtful infrastructure (multiple water-points, social-stable groupings) matters.
• Operator labor — moves every 30–60 minutes during grazing means very high operator-attention demands; fatigue mistakes happen.
• Forage limitation — if forage in a sub-paddock is genuinely insufficient, animals will leave hungry; proper forage budgeting is essential.

Lenses still to grow

• Specific UHSDG case studies (Greg Judy, Allan Williams clients)
• Comparative research on mob-grazing vs UHSDG outcomes
• Soil-compaction risk and mitigation strategies
• The role of UHSDG in cover-crop grazing within cropping rotations

See also

Auto-generated from this entry’s typed relations: frontmatter, grouped by relation type so the editorial signal isn’t flattened.

• Subset of: [[mob-grazing]]
• Enables: [[integrated-crop-livestock]]
• Shares approach with: [[holistic-management]]
• Member of: [[practice]]

Sources

• [[allan-savory|Allan Savory]] & Jody Butterfield, Holistic Management (3rd ed., 2016)
• Greg Judy, No-Risk Ranching and educational publications
• Understanding Ag (understandingag.com) educational materials
• Stephen Briske et al., comparative grazing research (cautionary perspectives)
• Stockman Grass Farmer archive

Rooted in life.