Claims checked › Claim
Mob grazing grows more grass
“Mob grazing, very high density with long rests and trampled litter, grows more grass and more soil than ordinary rotational grazing.”
Rotation does grow and use more grass than set stocking on improved pasture. No controlled study yet shows mob or holistic grazing growing more forage than ordinary rotation. The best-known UK mob-grazing account saved £380 a livestock unit in inputs while cattle finished four months later and 30 kg lighter.
Where it comes from
Farmer networks, grazing consultancies and a run of enthusiastic farm-press features. The underlying truth, that resting grass grows more of it, is real and belongs to rotation in general.
Who benefits
Grazing consultants and course providers, and fencing and water-system suppliers. Farmers who have adopted the method also have a stake in its reputation.
What the evidence says
Rotation beats set stocking on improved pasture. Ireland's Teagasc puts the gain at up to 0.25 kg of liveweight a day and values an extra spring day at grass at €51 for a 40-cow herd (2026, Teagasc); Scotland's SRUC says converts "have doubled their output" through stocking and performance (2025). Rothamsted's interim trial found more soil organic matter, fewer weeds and more liveweight per hectare than set stocking (UK, 2023, as reported).
Mob or holistic against rotation: nothing controlled yet. The 2017 meta-analysis of Holistic Planned Grazing found no difference in plant biomass from continuous grazing (Hawkins 2017); an independent review concluded holistic grazing is "good grazing management, but nothing suggests that it is better than other well-managed grazing methods" (Nordborg 2016). Defra's nine-farm UK comparison of mob and conventional grazing, started in 2021, has not yet published results (FarmPEP).
The best-known UK account is an input story. A Fife estate reports £380 saved per livestock unit a year under mob grazing: £80,000 in straw, £92,000 in machinery, over £250,000 in fertiliser and £13,000 in minerals no longer bought. Cattle now finish at 24 to 29 months instead of 20 to 26, at about 320 kg carcasses instead of 350 (Scotland, 2020, Farmers Weekly; single farm, converting to organic at the same time). Lower costs and slower, lighter stock is a legitimate trade, not more grass.
What to say instead
"Rest grows grass; that belongs to any rotation. Whether trampling a third of it grows more is untested." Trial mob grazing on one block against a working rotation at the same stocking rate, and count the finishing months. The rotational grazing page keeps the two questions apart.