Yoghurt Production & Manufacturing

The Yoghurt Manufacturing Process

Commercial yoghurt production follows a consistent sequence of steps. The table below summarises the main stages, typical conditions and the purpose of each.

The Main Yoghurt Styles

No-Whey (Whey-less) Yoghurt

The no-whey approach builds a high-solids, high-protein yoghurt — Greek-style, Quark, or Skyr equivalent — without going through a separation step. Total solids are raised by adding skimmed milk powder, milk concentrate, ultrafiltration retentate or milk protein concentrate, until all the water is bound into the finished product.

The commercial advantages over traditional strained Greek-style production are substantial:

• Lower capital cost — no separator or membrane concentration plant for the finishing step
• Lower operating cost — no energy, cleaning or labour for a separation stage
• No acid-whey disposal — removing the by-product removes a real environmental and cost headache
• Higher overall yield — all milk solids end up in saleable product rather than being lost to whey
• Batch-to-batch consistency — a formulated recipe is easier to control than a separation step

The trade-off is in recipe complexity: balancing the added solids and proteins so the finished product has the right mouthfeel, flavour and stability requires careful formulation. That is where independent technical support is most valuable.

Recipe Levers That Move Yoghurt Quality

Common Yoghurt Quality Problems

How We Engage

Frequently Asked Questions

What cultures are used in yoghurt?

Traditional yoghurt uses a symbiotic blend of two lactic acid bacteria, Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus, which ferment lactose to lactic acid and develop the characteristic flavour, acidity and texture. Many products also add probiotic cultures such as Lactobacillus acidophilus and Bifidobacterium. Culture selection, inoculation rate and incubation temperature all strongly affect the final product.

What is the difference between set and stirred yoghurt?

Set yoghurt is incubated and gelled in its final retail pot, giving a firm, undisturbed gel. Stirred yoghurt is fermented in bulk tanks, then the gel is broken by stirring, cooled, optionally blended with fruit or flavour, and filled, giving a smoother, pourable or spoonable texture. The choice affects equipment, plant layout and the texture of the finished product.

How is Greek (strained) yoghurt made?

Greek or strained yoghurt is concentrated to raise its protein and solids content, traditionally by straining off whey, or in modern plants by membrane filtration or centrifugal separation. This gives the thick, rich texture and higher protein associated with Greek yoghurt. The whey stream is a significant by-product that needs a disposal or value-recovery plan in a commercial operation.

What causes whey separation (syneresis) on top of yoghurt?

That watery layer is whey separation, known as syneresis, where the protein gel contracts and releases liquid. It is usually caused by over-acidification, temperature fluctuation, rough handling, low total solids or the wrong stabiliser balance. Controlling solids, process temperature, gentle handling and culture activity reduces it.

What causes blown yoghurt packs?

Blown packs are usually caused by contamination with yeasts and moulds or gas-producing organisms, often from poor hygiene, inadequate fruit or ingredient quality, weak pack seals or a broken cold chain. Good HACCP, hygienic design, ingredient control, correct storage temperature and seal integrity are the main defences.

What is no-whey yoghurt and why is it used?

A no-whey or whey-less yoghurt process makes a thick, high-solids yoghurt such as Greek-style, Quark or Skyr without removing whey. Instead of straining or separating whey out, the mix is formulated with enough total solids - using added milk protein, milk powder or membrane-filtered milk - that all the water is bound into the finished product. This avoids the cost of separation equipment, removes the acid-whey by-product, and improves overall yield, at the expense of a more carefully balanced recipe.

Do you advise on yoghurt manufacturing projects?

Yes. Watson Dairy Consulting provides independent support for yoghurt manufacturing and factory projects, including process and recipe development, equipment and plant selection, factory layout, capacity and yield, shelf life, HACCP and quality control.

Further reading: John Watson publishes articles on dairy industry topics on LinkedIn — from infant formula safety and milk supply to plant design, yield improvement and dairy commodity outlook. Browse all articles by John Watson on LinkedIn →

See our related yoghurt factory design, frozen yoghurt, membrane filtration (Greek-style concentration), ice cream production, dairy factory design and dairy science information pages, or browse all consultancy services.