Source
https://library.uniteddiversity.coop/Food/Food_Production_and_Processing/butter_and_ghee_1_.pdf — original source (opens in a new tab; the file is not redistributed)
Practical Action “Butter and Ghee” — small-scale process brief (Fellows, 2008)
A PROCESS reference for the milkfat → butter chain — the numeric fat-recovery fraction (RT_388) is NOT in this file
Practical Action / Schumacher Centre technical brief by Peter Fellows (Aug 2008). It documents the small-scale cream-separator + churn butter-making process end to end (separate, pasteurise, chill, churn, wash, salt, work, pack), plus lactic butter and ghee variants. It is the process leg behind the community-dairy → edible-fat chain that OT_173 costs and RT_388 quantifies. 🔴 This brief states NO numeric fat-recovery percentage. Confirmed by full read + grep: the only percentages present are milk/whey fat contents (Table 2; whey 3.5–8.75%), never a churning/separation recovery fraction. It gives the mechanism only — fat is lost to the buttermilk, and losses rise with churning temperature. 🔴 The recovery figure the model needs is EXTERNAL to this file — ~95% (mechanical separator + churn) vs ~60–76% (traditional no-separator churning) come from the Guelph Dairy Science eBook (books.lib.uoguelph.ca) and FAO Animal Production & Health Paper 85 (fao.org/4/t0251e), neither of which is this document. Notably this brief cites the Guelph text (Goff, University of Guelph) as a reference, so the external primary is name-linked from here, but its number is not reproduced. RT_388 stays PARTIAL — process referenced, numeric primary still external + unretrieved.
Summary
Butter and Ghee is an 8-page technical brief produced by Peter Fellows for Practical Action (The Schumacher Centre for Technology and Development, UK) in August 2008, one of the organisation’s small-scale food-processing series aimed at micro- and small-enterprise producers in developing-country contexts. It sets out how to make four butter types (fresh/sweet, lactic/cultured, whey, and ghee) at village scale: the equipment (cream separator, churn, pasteurising pan, moulds), the step-by-step process with temperatures and churn speeds, HACCP/quality-assurance control points, and packaging/storage to control rancidity.
Its value to Neobiome is as the process documentation behind the community-dairy edible-fat pathway modelled in d02_smart_food_systems. It settles how milkfat becomes butter at small scale (and the equipment fork — with vs without a cream separator — that governs recovery), and it corroborates the ~0.82 butter fat-content denominator with a verbatim “>80% fat / ~16% water” composition. It does not settle the one quantitative unknown in the chain — the fat-recovery fraction (RT_388) — which lives in the external Guelph/FAO sources this brief only references. Non-NZ and generic, so data_quality: medium.
Key claims
- claim: "BUTTER COMPOSITION — cross-check on the 0.82 conversion denominator. Verbatim: butters 'contain more than 80% fat with a small amount of water dispersed through the fat' and 'Most butters contain about 16% water.' Consistent with the ~82% butter fat content OT_173 uses to convert milkfat to butter. [verified verbatim against the raw]"
source_location: "p.1 — Introduction (types of butter) and composition paragraph."
- claim: "NO NUMERIC FAT-RECOVERY % IS STATED — mechanism only. Verbatim: 'If the temperature is too high, there are greater losses of fat into the buttermilk' (churn notes) and 'A higher temperature during churning reduces the butter yield, because some of the butterfat liquefies, and is lost with the buttermilk.' The brief establishes that recovery is temperature-dependent and that fat is lost to the buttermilk, but gives NO fraction. [negative finding — confirmed by full read + grep; the recovery % is external, see Notes]"
source_location: "p.2 (Figure 1, Churn stage notes) and p.5 (Process control, no-refrigeration problems)."
- claim: "FAT CONTENT OF MILK BY ANIMAL (Table 2, 'From: Opportunities in Dairy Processing'), Fat %: Buffalo 7.4, Camel 5.4, Cow 3.7, Goat 4.2, Horse 1.6, Llama 3.2, Sheep 7.9, Yak 8.0. Upstream term of the milkfat→butter chain; the Cow 3.7% is a generic (non-NZ) cross-check on kg-milkfat-per-litre. [verified verbatim against the raw]"
source_location: "p.3 — Table 2, Fat content of milk from different types of animals."
- claim: "WHEY BUTTERFAT CONTENT: verbatim 'Whey has a butterfat content of 3.5 - 8.75%, depending on the type of cheese being made.' Relevant to a whey-butter by-product pathway off community cheese-making. [verified verbatim against the raw]"
source_location: "p.1 — Methods of processing (whey butter paragraph)."
- claim: "EQUIPMENT FORK — separator vs no separator (the fork that governs recovery). Verbatim: lactic butter 'can be made more easily than fresh butter at a micro- or small-scale because they do not require the use of a cream separator'; and for ghee '(Traditionally cream is not separated and whole milk is boiled and cooled several times and the fatty scum is skimmed off).' This is the mechanical-separator vs traditional-churning distinction the external recovery figures (~95% vs ~60-76%) split on. [verified verbatim against the raw]"
source_location: "p.4 — Lactic butter paragraph; Ghee method step 2."
- claim: "SMALL-SCALE CHURN PROCESS PARAMETERS: 'Fill the churn to 40-50% of capacity... Churn at 25-35 rpm for 5 minutes... Churn again at 25-35 rpm for 20-45 minutes' until butter grains form; 'Keep the temperature as low as possible during churning.' Equipment list for fresh butter: butter churn, moulds (optional), butter pats, cream separator (manual or electric), pasteurising pan, refrigerator. [verified verbatim against the raw]"
source_location: "p.2 (Figure 1, Churn stage) and p.6 (Equipment required)."Neobiome Intelligence relevance
Feeds d02_smart_food_systems as the PROCESS leg of the community-dairy → edible-fat chain costed by OT_173. The chain is:
cows × kg milkfat/cow ([[ot_172_dairynz-dairy-stats-2023-24|OT_172]])
× churning/separation recovery fraction ← STILL EXTERNAL + UNRETRIEVED (RT_388)
÷ 0.82 butter fat content (OT_173; corroborated here by ">80% fat")
= kg butter/yr
What this source settles:
- The how — the actual small-scale separator + churn process, its temperatures, churn regime and equipment list, so a community-dairy pathway can be described, not just numbered.
- The equipment fork that drives recovery: with a cream separator + churn vs traditional no-separator churning/skimming. This is the exact split the external recovery figures hang on (~95% mechanical vs ~60–76% traditional).
- A composition cross-check on the 0.82 denominator (“>80% fat”, “~16% water”).
What it does NOT settle (the point of flagging it):
- The recovery fraction is still not sourced here. This brief gives the mechanism (fat lost to buttermilk, temperature-dependent) but no number. The ~95% / ~60–76% figures are in the Guelph Dairy Science eBook and FAO APHP 85, which this brief references but does not reproduce. Until one of those is retrieved and verified, community butter output must stay a band across a stated recovery assumption, never a point estimate (same discipline as OT_173).
- Non-NZ, generic. The milk-fat-by-animal figures are a global compilation (“Opportunities in Dairy Processing”), not NZ coefficients.
Notes
- The key numeric primary is EXTERNAL, not in this file. The fat-recovery percentage RT_388 needs (~95% separator+churn; ~60–76% traditional) is NOT stated in this brief. It comes from the Guelph Dairy Science eBook (books.lib.uoguelph.ca) and FAO Animal Production & Health Paper 85 (fao.org/4/t0251e). If a recovery % is ever written into the model, its
source_locationmust cite that external URL — never this brief. This page deliberately records the mechanism and the fork, not a fabricated fraction. - No in-file figure feeds a model cell — the thing that would (the recovery %) is absent. The figures present (composition, milk fat by animal, whey butterfat) are generic cross-checks, verified verbatim.
- Direct authoritative download, not AI-prepared — the actual Practical Action PDF.
- Authority vs specificity. Authoritative and reliable for process (recognised author, established series); weak as a model-figure source (generic, non-NZ, and missing the one number the model wants). Hence
data_quality: medium.
Research targets
Documents to retrieve
- RT_388 (PARTIAL — advanced, not closed) — the churning / separation fat-recovery fraction. This brief documents the process and the separator-vs-no-separator fork but states no fraction. The number remains external: retrieve and verify the Guelph Dairy Science eBook (books.lib.uoguelph.ca) and/or FAO APHP 85 (fao.org/4/t0251e) for ~95% (mechanical separator + churn) and ~60–76% (traditional no-separator churning), then apply as a band.
Connections
Links to
Referenced by