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Fermentation Atlas

Cheese from Switzerland

Emmentaler AOPEmmentaler

Raw cow milk from silage-free farms is set in a copper vat with lactic and propionic cultures, cut and cooked to 52–54 °C, then pressed into wheels of 75–120 kg and brined. In a warm cellar at 19–24 °C propionic bacteria make the gas that opens its large round eyes, and the wheels then ripen in a cooler cellar for at least four months. Made in 8 steps over 5.1 months – 6.5 months. The longest step, ripen in the storage cellar, takes at least 4 months (Office fédéral de l'agriculture OFAG 2002) and runs at 11–14 °C (Office fédéral de l'agriculture OFAG 2002). Lactic acid bacteria cultures of defined make-up from the production area and Thermophilic starters Streptococcus thermophilus and Lactobacillus helveticus, still active to the end of ripening do most of the fermenting.

Key numbers
Main stepat least 4 monthsSet[ofag-emm]Ripen in the storage cellar
Temperature11–14 °CSet[ofag-emm]Ripen in the storage cellar

Recipe

Amounts from a sourceThe specification sets limits, not a recipe. A dairy may make at most three batches a day, and each wheel weighs 75–120 kg, about 90 kg on average.
Raw cow milk · No silage on the farm; at least 70 % roughage in the ration by dry matter; at least 8 hours between milkings; no bactofugation or filtration[ofag-emm]
Lactic acid bacteria cultures · Of defined make-up, from the area, grown in milk, skim milk or whey; direct-vat starters for acidifying the milk are not allowed[ofag-emm]
Propionic acid bacteria cultures · Selected for Emmentaler[ofag-emm]
Rennet[ofag-emm]
0–12 % of the milk, 0–20 % of the curdDrinking water[ofag-emm]
Salt · As brine at 20–22 °Bé[ofag-emm]
Eye-forming powder · Listed as an allowed aid in the 2025 version of the specification[ofag-emm]
Starterdefined lactic cultures from the area plus propionic cultures and rennet

Total time across the recorded steps: 5.1 months – 6.5 months

Start
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up to 40 °C

What changes: Starting material: raw milk from cows fed no silage, at most a day old

Step 1 of 8
Collect the raw milk
Time
up to 24 h
Set
Temperature
up to 40 °C
Set
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Lactic acid bacteria
S. thermophilus
Lactobacillus helveticus
P. freudenreichii

Farms lie within 20 km of the dairy as the crow flies. Bactofugation, ultrafiltration and microfiltration are forbidden. Output: raw cow milk.

Flavour
Not documented
Texture
Not documented
Colour
Not documented

Microbes at work in this step

Not documented for this step.

Method

Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source

What makes this one different

Emmentaler's mark is its propionic fermentation. A spell of weeks in a warm cellar lets propionic bacteria make the gas that opens its big eyes and gives its sweet, nutty taste, which most alpine hard cheeses such as Gruyère avoid. Its wheels are also among the largest made, up to 120 kg.

Milk
Raw cow milk from silage-free farms, made into cheese within 24 hours
Cooking
Curd heated to 52–54 °C
Ripening
At least 4 months in the area; warm cellar 30–70 days at 19–24 °C
Size
80–100 cm across, 16–27 cm high, 75–120 kg (about 90 kg on average)
Composition
450–549 g fat per kg dry matter; at least 275 g fat and at most 380 g water per kg of cheese

Related ferments

Variants

  • Emmentaler AOP Höhlengereift (cave-aged)At least 12 months old, with at least six months in the damp air of a rock cellar.
  • Emmentaler AOP URTYPBrand line matured 12–15 months, at least 7 of them in a humid cellar (Emmentaler Switzerland).

Safety

Made from raw milk, but cooked to 52–54 °C, pressed and ripened at least four months. ANSES exempts pressed cooked cheeses such as Gruyère and Comté from its advice to avoid raw-milk cheese, and Emmentaler is made in the same way.

History and sources

Every number is labelled with how it is known. How this atlas is made

Emmentaler takes its name from the Emmental valley in Bern and has been made there since the 12th century; a Langenthal register first names it in 1542. It was first made only on the alps, and the first valley dairy opened at Kiesen in 1813. From 1840 it spread across German-speaking Switzerland and was exported. It was registered as a protected designation of origin in 2002.

  1. [ofag-emm] Office fédéral de l'agriculture OFAG, Cahier des charges Emmentaler (AOP), registered 26 July 2002, as amended up to the decision of 4 November 2025spec
  2. [ofag-emm-2002] Office fédéral de l'agriculture OFAG, Résumé de la demande d'enregistrement pour l'Emmentaler, 26 July 2002gov
  3. [emmentaler-ch] Emmentaler Switzerland, Maturing cheese: the secret of affinageweb
  4. [falentin2012] Falentin H. et al. 2012, Reverse transcription quantitative PCR revealed persistency of thermophilic lactic acid bacteria metabolic activity until the end of the ripening of Emmental cheese, Food Microbiology 29(1):132-140 (abstract)paper
  5. [gagnaire2015] Gagnaire V. et al. 2015, Emmental cheese environment enhances Propionibacterium freudenreichii stress tolerance, PLoS One 10(8):e0135780 (abstract)paper
  6. [anses2022] ANSES 2022, Fromages au lait cru, quels risques pour la santé et comment mieux les prévenir (8 April 2022)gov